Resistance

Resistance

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Related questions

Temperature co-efficient of resistance is expressed in terms of?

Description : Temperature co-efficient of resistance is expressed in terms of?

Last Answer : Degree celsius

International ohm is defined in terms of the resistance of?

Description : International ohm is defined in terms of the resistance of?

Last Answer : International ohm is defined in terms of the resistance of a column of mercury.

When resistance element of a heater fuses and then we reconnect it ...

Description : When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will?

Last Answer : When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will increase.

Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as?

Description : Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as?

Last Answer : Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as 2 : 5.

Resistance of a material always decreases if?

Description : Resistance of a material always decreases if?

Last Answer : Resistance of a material always decreases if number of free electrons available become more.

The hot resistance of the bulb's filament is higher than its cold resistance because...

Description : The hot resistance of the bulb's filament is higher than its cold resistance because the temperature co-efficient of the filament is?

Last Answer : This  is  because  resistance  of  a  conductor  increases  with  increase  in  temperature .

A closed switch has a resistance of?

Description : A closed switch has a resistance of?

Last Answer : A closed switch has a resistance of zero.

If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes?

Description : If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes?

Last Answer : If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes 0.4 ohm.

The resistance of a few meters of wire conductor in closed electrical circuit is?

Description : The resistance of a few meters of wire conductor in closed electrical circuit is?

Last Answer : The resistance of a few meters of wire conductor in closed electrical circuit is practically zero.

With rise in temperature the resistance of semi-conductors?

Description : With rise in temperature the resistance of semi-conductors?

Last Answer : With rise in temperature the resistance of semi-conductors decreases.

With rise in temperature the resistance of pure metals?

Description : With rise in temperature the resistance of pure metals?

Last Answer : With rise in temperature the resistance of pure metals increases.

The resistance of a conductor varies inversely as?

Description : The resistance of a conductor varies inversely as?

Last Answer : The resistance of a conductor varies inversely as area of cross-section.

What affect does the thickness of a wire have on its resistance?

Description : What affect does the thickness of a wire have on its resistance?

Last Answer : Ans: The resistance of a wire decreases as its thickness increases.

Which of these has the lowest resistance?

Description : Which of these has the lowest resistance?

Last Answer : b) Copper has the lowest resistance. 

Name two materials that have a different electric resistance.

Description : Name two materials that have a different electric resistance. 

Last Answer : Ans: a) copper, nichrome 

State the procedure for testing of earth pit resistance with necessary diagrams.

Description : State the procedure for testing of earth pit resistance with necessary diagrams.

Last Answer : Following procedure (Method) for testing of earth pit resistance with necessary diagrams. 1) Earth Tester : i) Three point method ii) Four point method 2) By Potential drop method 3 ... of that earthing pit. In this test the accuracy is less but electrical rods are not required. 

State the impact of inductance and resistance on transmission line performance

Description : State the impact of inductance and resistance on transmission line performance

Last Answer : Impact of inductance on transmission line: 1) It causes IXL drop in transmission line which affects regulation. 2) It is the only parameter which decides power transmission capacity of line i. ... is very small, it causes losses, temperature rise& poor voltage regulation so it cannot be neglected

What do you mean by exciting resistance and exciting reactance?

Description : What do you mean by exciting resistance and exciting reactance?

Last Answer : At no-load, a transformer behaves as a highly inductive load connected to the system which contains some resistance and inductance in parallel. The resistance is called exciting resistance R0 = V1/I w and reactance is called exciting reactance, X0 = V1/I mag

what is equivalent resistance when four 4 Ohm resistors are connected in i) series ii) parallel

Description : what is equivalent resistance when four 4 Ohm resistors are connected in i) series ii) parallel

Last Answer : equivalent resistance

role of the series resistance connected in PMMC movement.

Description : role of the series resistance connected in PMMC movement.

Last Answer : A PMMC Instrument can be used as voltmeter by just connecting a series resistance with the moving coil. This series resistance is called Voltmeter Multiplier. This combination of moving coil and ... current whose voltage is to be measured. Ideally the resistance of voltmeter should be infinite

Define resistance with its unit.

Description : Define resistance with its unit.

Last Answer : Resistance is a measure of the degree to which a substance impedes the flow of electric current induced by a voltage.  Or Resistance is the opposition to current flow in an electrical circuit. Unit is ohm.(Ω)

List two advantages of platinum resistance thermometer.

Description : List two advantages of platinum resistance thermometer.

Last Answer : 1. The platinum resistance thermometer is stable 2. It is resistant to corrosion 3. It is resistant to oxidation

How does the resistance of a conductor compare to that of an insulator?

Description : How does the resistance of a conductor compare to that of an insulator?

Last Answer : The resistance of a conductor can be significantly lower than the resistance of an insulator, depending on each material's atomic properties.

Resistance formula

Description : Resistance formula

Last Answer : The formula for resistance is, Where, R = resistance in Ohms ρ = resistivity in ohm - metre l = length A = cross sectional area

Parallel Reactance and Resistance Example 1

Description : Parallel Reactance and Resistance Example 1

Last Answer : Parallel Reactance and Resistance Example 1

AC Circuits with Resistance but No Reactance

Description : AC Circuits with Resistance but No Reactance

Last Answer : AC Circuits with Resistance but No Reactance AC Circuits with Resistance but No Reactance Series resistances let two resistances R 1 and R 2 are connected in series as shows in figure and there ... voltage. Voltage V A is common to both the branch hence voltage V A is common reference.

Problems on resistance and resistivity

Description : Problems on resistance and resistivity

Last Answer : Problem on resistance and resistivity 1 : https://youtu.be/OqavD7OlZUs Problem on resistance and resistivity 2 : https://youtu.be/0eo8VO8cpwk Problem on resistance and resistivity 3 : https:// ... https://youtu.be/3neLRCTz0RQ Problem on resistance and resistivity 13 : https://youtu.be/vBCkvPOiztY

Problem on temperature coefficient of resistance 3

Description : Problem on temperature coefficient of resistance 3

Last Answer : Problem on temperature coefficient of resistance 3

Problem on temperature coefficient of resistance 2

Description : Problem on temperature coefficient of resistance 2

Last Answer : Problem on temperature coefficient of resistance 2

Problem on temperature coefficient of resistance 1

Description : Problem on temperature coefficient of resistance 1

Last Answer : Problem on temperature coefficient of resistance 1

Problem on resistance and resistivity 13

Description : Problem on resistance and resistivity 13

Last Answer : Problem on resistance and resistivity 13

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Description : Problem on resistance and resistivity 12

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Description : Problem on resistance and resistivity 11

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Description : Problem on resistance and resistivity 9

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Description : Problem on resistance and resistivity 7

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Description : Problem on resistance and resistivity 6

Last Answer : Problem on resistance and resistivity 6

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Description : Problem on resistance and resistivity 5

Last Answer : Problem on resistance and resistivity 5

Problem on resistance and resistivity 4

Description : Problem on resistance and resistivity 4

Last Answer : Problem on resistance and resistivity 4

Problem on resistance and resistivity 3

Description : Problem on resistance and resistivity 3

Last Answer : Problem on resistance and resistivity 3

Problem on resistance and resistivity 2

Description : Problem on resistance and resistivity 2

Last Answer : Problem on resistance and resistivity 2

Problem on resistance and resistivity 1

Description : Problem on resistance and resistivity 1

Last Answer : Problem on resistance and resistivity 1

Compare between Resistance welding and Arc welding on any six points.

Description : Compare between Resistance welding and Arc welding on any six points.

Last Answer : Sr.No Parameters Resistance Welding Arc Welding 1 Type of welding Plastic/Pressure/Non-fusion welding Fusion/Non pressure welding 2 Principle of heat developed Heat ... It is suitable for mass production It is suitable for heavy job, maintenance and repair work

Name two methods for measurement of low, medium and high resistance. Give one advantage and one limitation of V- I method.

Description : Name two methods for measurement of low, medium and high resistance. Give one advantage and one limitation of V- I method.

Last Answer : Methods for measurement of low resistance:  1. Ammeter voltmeter method  2. Kelvin's bridge method  3. Ohm meter method  4. Potentiometer method  5. Digital/analog multi-meter ... must be infinity for perfectly accurate measurement which is not possible.  2. Connection errors.

Name the method used to measure following resistances:- (i) Low resistance (ii) Medium resistance (iii) Insulation resistance (iv) Earth resistance.

Description : Name the method used to measure following resistances:- (i) Low resistance (ii) Medium resistance (iii) Insulation resistance (iv) Earth resistance.

Last Answer : Following are the methods used to measure resistances:-  (i) Low resistance: 1.Voltmeter-Ammeter Method 2. Kelvin's Double bridge Method  (ii) Medium resistance: 1.Voltmeter-Ammeter Method 2. ... of Charge Method  (iv) Earth resistance : 1. Fall of Potential Method 2. Earth tester

Write any two factors on which earth resistance depends.

Description : Write any two factors on which earth resistance depends.

Last Answer : Factors on which earth resistance depends: (1) The shape and material used for the electrode (2) Depth of the electrode in the ground. (3) The specific resistance of the soil around the electrode (4) Moisture content in the soil. (5) Nature of soil 

State the use of shunt and series resistance used in extension of meter.

Description : State the use of shunt and series resistance used in extension of meter.

Last Answer : Use of shunt and series resistance: i) Use of shunt: To extend the range of Ammeter. ii) Use of series resistance: To extend the range of Voltmeter.

State the range for low and medium resistance.

Description : State the range for low and medium resistance.

Last Answer : Low resistances: less than 1 ohm.  Medium resistances: 1 ohm to 0.1 Mega ohm. 

Explain V- I method of measurement of medium resistance.

Description : Explain V- I method of measurement of medium resistance. 

Last Answer : In this method, use suitable source, ammeter and voltmeter and connect them as shown in the above diagram. Take reading of voltmeter and ammeter, then value of resistance = R = V/I Ω To minimise the error take 4 to 5 observation for the same resistance and take their average.