What is the loading effect of a voltmeter?

1 Answer

Answer :

The connection of a voltmeter adds a resistance in parallel with  the circuit changing the total circuit resistance, and loads the circuit.

Related questions

Description : How is the loading effect of a voltmeter kept to a minimum?

Last Answer : A voltmeter must have a high resistance compared to the circuit being measured.

Description : When troubleshooting most electronic circuits, 'loading effect' can be minimized by using a voltmeter with a/an ___________________. A. input impedance much greater than the impedance across which the voltage ... sensitivity of less than 1000 ohms/volt D. sensitivity of more than 1000 volts/ohm

Last Answer : Answer: A

Description : Explain sensitivity and loading effect in voltmeter.

Last Answer : Sensitivity: The sensitivity of a voltmeter is just its capability to detect voltage, usually meaning smaller and smaller voltages. When selecting a meter for a certain voltage measurement, it is ... called loading effect of the voltmeters. It is mainly caused due to low sensitivity instruments.

Description : Describe following terms w.r.t. Analog voltmeter : (i) Sensitivity (ii) Loading effect

Last Answer : Sensitivity: The sensitivity of a voltmeter is just its capability to detect voltage, usually meaning smaller and smaller voltages. When selecting a meter for a certain voltage measurement, it is ... called loading effect of the voltmeters. It is mainly caused due to low sensitivity instruments.

Description : When taking a voltage measurement, which lead of the voltmeter should you connect to the circuit first?

Last Answer : Ground.

Description : On what range should you set the voltmeter prior to taking a voltage measurement?

Last Answer : Highest.

Description : If an ac voltmeter is connected between the S2 and S3 windings on a TX, at what two rotor positions should the voltmeter read maximum voltage?

Last Answer : . 150º and 330º

Description : What should a voltmeter read when a TX is set on coarse zero?

Last Answer : Approximately 37 volts.

Description : What is the advantage of using a battery test set versus a voltmeter to test batteries?

Last Answer : A battery test set will test batteries under load conditions.

Description : What is the general function of the differential voltmeter?

Last Answer : To compare an unknown voltage with a known reference voltage and indicate the difference in their values.

Description : Why would you use a hook-on voltmeter instead of a multimeter?

Last Answer : To measure current safely and easily (with no need to disconnect the wiring of the circuit).

Description : Why should you always use the highest range when connecting a voltmeter to a circuit?

Last Answer : To prevent excess current through the meter movement.

Description : What method is used to allow a voltmeter to have several ranges?

Last Answer : The use of resistors in series with the meter movement.

Description : What is voltmeter sensitivity?

Last Answer : It is an indication of the resistance of the meter expressed in ohms per volt. The total resistance of the meter is the sensitivity multiplied by the full-scale voltage.

Description : How is a voltmeter connected to the circuit to be measured?

Last Answer : In parallel.

Description : What electrical quantity is measured by a voltmeter?

Last Answer : Voltage.

Description : What term is used to express the sensitivity of a voltmeter?

Last Answer : Ohms per volt

Description : When making voltage measurements in a high-resistance circuit, you should always use a voltmeter with what relative value of resistance?

Last Answer : . High.

Description : What are the advantages of using a differential voltmeter?

Last Answer : Accuracy and high input impedance.

Description : The loss of strength in compression which occurs, when there is a gain of strength in tension due to over loading is called (A) Bauschinger effect (B) Hooke's effect (C) Hysteresis (D) Relaxation

Last Answer : (A) Bauschinger effect

Description : Loading effect is principally caused by instruments   (a) High resistance (b) Low sensitivity (c) High sensitivity (d) High range

Last Answer : B

Description : The apparent change in frequency or pitch because of motion is explained by what effect?

Last Answer : The Doppler effect.

Description : If the output impedance of an amplifier circuit is decreased, what is the effect on the gain?

Last Answer : The gain decreases.

Description : If the input-signal-developing impedance of an amplifier is increased, what is the effect on the gain?

Last Answer : The gain increases.

Description : What effect does flux leakage in a transformer have on the coefficient of coupling (K) in the transformer?

Last Answer : it causes K to be less than unity (I).

Description : What effect does closer spacing of plates have on the electron beam?

Last Answer : A greater deflection angle.

Description : What effect does flux leakage in a transformer have on the coefficient of coupling (K) in the transformer?

Last Answer : it causes K to be less than unity (I).

Description : What effect does closer spacing of plates have on the electron beam?

Last Answer : A greater deflection angle.

Description : What effect do longer deflection plates have on the electron beam?

Last Answer : A greater deflection angle.

Description : What effect does an increase in capacitance have on a capacitor’s opposition to current flow?

Last Answer : Opposition to current flow decreases.

Description : What effect does transit time have on a conventional triode operated at uhf frequencies?

Last Answer : It causes the control grid to short to the cathode

Description : What effect does the shielding of the screen grid by the control grid have on plate current in beam-forming tetrodes?

Last Answer : By increasing the number of electrons that reach the plate, plate current is increased.

Description : Applying a reverse bias to the gate of an FET has what effect?

Last Answer : Source-to-drain resistance increases.

Description : During avalanche effect breakdown, what limits current flow through the diode?

Last Answer : an external current-limiting resistor

Description : What is the doping level of an avalanche effect diode when compared to the doping level of a Zener-effect diode?

Last Answer : The doping level of an avalanche effect diode is lower.

Description : How is the effect of load flux on control flux eliminated in a saturable-core reactor?

Last Answer : use two load windings whose flux effects cancel in the core of the reactor or use two load windings on two toroidal cores so that load flux always aids control flux in one core and opposes control flux in the other core.

Description : Which layer of the atmosphere has relatively little effect on radio waves?

Last Answer : Stratosphere.

Description : A loss of receiver sensitivity has the same effect on range performance as what other loss?

Last Answer : Transmitter power loss.

Description : When a large signal and a small signal are applied to a lin log amplifier at the same time, what is the effect on the small signal?

Last Answer : Amplification is reduced.

Description : What is the effect on magnetron operation if the magnetic field strength is too high?

Last Answer : The magnetron will not oscillate.

Description : What is the effect on magnetron operation if the magnetic field strength is too high?

Last Answer : The magnetron will not oscillate.

Description : The Doppler effect causes a change in what aspect of rf energy that strikes a moving object?

Last Answer : Frequency.

Description : What factor has the greatest effect on the physical size of a coaxial cable?

Last Answer : The dielectric constant of the insulating material.

Description : Losses caused by skin effect and the I2R (power) loss are classified as what type of loss?

Last Answer : Copper losses.

Description : Light travels faster in a material with a lower refractive index. Therefore, light rays that travel a longer distance in a lower refractive index travel at a greater average velocity. What effect does this have on multimode graded-index fiber modal dispersion and bandwidth?

Last Answer : Decreases the time difference between light rays, which reduces modal dispersion and increases fiber bandwidth.

Description : Trade-offs between competing effects are necessary for high speed response. Which competing effect (fast transit time, low capacitance, or high quantum efficiency) requires a thin active area?

Last Answer : Fast transit time.

Description : As the dissipated power increases, what effect does this have on the resistance of a thermistor?

Last Answer : . It increases.

Description : What is the primary advantage of bulk-effect devices over normal pn-junction semiconductors?

Last Answer : Larger microwave power outputs.

Description : Debunching of the electron bunches in the higher modes of a reflex klystron has what effect on output power?

Last Answer : Power is reduced.

Description : In a multicavity klystron, tuning all the cavities to the same frequency has what effect on the bandwidth of the tube?

Last Answer : The bandwidth decreases.