Home
Class 12
PHYSICS
When a voltage measuring device is conne...

When a voltage measuring device is connected to AC mains, the meter shows the steady input voltage of 220 V. This means

A

input voltage cannot be A.C. voltage, but a D.C. voltage.

B

maximum input voltage is 220 V.

C

the meter reads not v but `ltv^2gt` and is calibrated to read `sqrtltv^2gt`

D

the pointer of the meter is stuck by some mechanical defect.

Text Solution

Verified by Experts

Promotional Banner

Similar Questions

Explore conceptually related problems

Two amplifiers having voltage gains 20 and 50 are connected as shown in the figure. If the initial input voltage is 25 mV, find the final output voltage obtained.

When an electric device X is connected to a 220 volt, 50 hertz a.c. supply, the current is 0.5 amp, and is in same phase as the applied voltage. When another device Y is connected to the same supply, the electric current is again 0.5amp, but it leads the potential difference by pi//2 . When X and Y are connected in serices across the same source, what will be the current ?

Draw a circuit, showing how an ammeter and a voltemter can be connected to a resistor to measure the current and voltage at a given instant.

A lamp rated 100 W at 220 V is connected to the mains electric supply. What current is drawn from the supply line if the voltage is 220V.

Primary of a transformer is connected to .5 V dry cell. What will be the output voltage?

When an AC voltage of 220 V is applied to the capacitor C.

When a circuit element X is conneted across a.c. sourceof emf 220sqrt2V , a current sqrt2 A flows through it and this current is in phase with applied voltage. When another element Y is connected across same a.c. source, the same current flows in the circuit, but it leads the voltages by pi//2. Find current that flows in the circuit when series combination of X and Y is connected acorss same a.c. voltage.

When a circuit element X is conneted across a.c. sourceof emf 220sqrt2V , a current sqrt2 A flows through it and this current is in phase with applied voltage. When another element Y is connected across same a.c. source, the same current flows in the circuit, but it leads the voltages by pi//2. Plot a graph showing variation of net impedance of series combination of X and Y as a function of angular frequency of applied voltage.

A transformer of 100% efficiency has 500 turns in the primary and 10,000 turns in the secondary coil. If the primary is connected to 220V mains supply, what is the voltage across the secondary coil?