Galvanometer and Voltmeter Quiz

If the maximum potential difference that can be withstood by the galvanometer's coil before connecting the voltage multiplier is 1 V, so the galvanometer's coil resistance equals ..... .

If the multiplier resistance in a voltmeter is ten times as large as the galvanometer's resistance and the maximum voltage that can be withstood by the galvanometer is V., then the maximum voltage that can be measured by the voltmeter equals ...

A voltmeter consists of a galvanometer of resistance R and a multiplier resistance of 50 R, so which of the following ratios equals 0.02?

• The ratio between the current intensity that passes in the galvanometer and that in the voltmeter.

• The ratio between the current intensity that passes in the galvanometer and that in multiplier resistance.

• The ratio between the voltage across the multiplier resistance and that across the voltmeter.

• The ratio between the voltage across the galvanometer and that across the multiplier resistance.

The opposite figure shows the graduation scale of a galvanometer after its calibration into a voltmeter scale, what does the ratio between the reading of the voltmeter and that of the galvanometer represent?

• R + R

• R - R

• Rm

• Rg

A galvanometer of resistance 100 Q that can withstand a maximum current of 0.01 A is required to be converted into a voltmeter, then: The multiplier resistance that makes it measure a potential difference up to 5 V is ....

A galvanometer shows full-scale deflection when an electric current of intensity 0.02 A passes through it when the potential difference between its two terminals is 5 V, so: The value of the multiplier resistance that makes the device suitable to measure a potential difference of 150 V equals .

The value of the maximum potential difference that can be measured by the device when it is connected to a multiplier resistance of 900 Q is ....

In a voltmeter device, the ratio between the electric current intensity which passes in the galvanometer coil and that which passes in the multiplier resistance that is connected to it is always ..... one.

• greater than

• equal to

• less than

• indeterminable

As the value of the multiplier resistance of a voltmeter increases, ..... .

• the total resistance of the device decreases

• the sensitivity of the device increases

• the range of the device to measure the potential difference decreases

• the accuracy of the device in measuring the potential difference increases

A voltmeter of resistance 2000 O can measure a maximum potential difference of 2 V. If it is connected to a multiplier resistor R-, its measuring range increases by 8 V, then the value of R is ....

• 2000 O

• 4000 O

• 6000 O

• 8000 O