MEDIUM
JEE Main/Advance
IMPORTANT
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An ammeter and a voltmeter are joined in series to a cell. Their readings are A and V, respectively. If a resistance is now joined in parallel with the voltmeter, 

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Important Questions on Current Electricity

MEDIUM
JEE Main/Advance
IMPORTANT
An ammeter and a voltmeter are connected in series to a battery with an emf ε=6.0 V. When a certain resistance is connected in parallel with the voltmeter, the reading of the voltmeter decrease η=2.0 times, whereas the reading of the ammeter increase the same number of times. Find the voltmeter reading after the connection of the resistance. 
MEDIUM
JEE Main/Advance
IMPORTANT
A galvanometer has resistance 100 Ω and it requires current 100 μA for full scale deflection. A resistor 0.1 Ω is connected in parallel to make it an ammeter. The smallest current required in the circuit to produce the full scale deflection is 
MEDIUM
JEE Main/Advance
IMPORTANT

Between which points should the terminals of unknown resistance be connected in a post office box arrangement to get its value?

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MEDIUM
JEE Main/Advance
IMPORTANT

Let V and I be the readings of the voltmeter and the ammeter respectively as shown in the figure. Let RV and RA be their corresponding resistance Therefore,

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MEDIUM
JEE Main/Advance
IMPORTANT

A 10 ohm resistor is connected to a supply voltage alternating between +4V and 2V as shown in the following graph. The average power dissipated in the resistor per cycle is 

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MEDIUM
JEE Main/Advance
IMPORTANT
Two cells each of emf E and internal resistance r1 and r2 respectively are connected in series with an external resistance R. The potential difference between the terminals of the first cell will be zero when R is equal to
MEDIUM
JEE Main/Advance
IMPORTANT

In the circuit shown below, E1=3 V, E2=2 V, E3=1 V,and R=r1=r2=r3=1 Ω(i) Find potential difference between the points A and B with A & B disconnected.
(ii) If r2 is short-circuited and the point A is connected to point B by a zero resistance wire, find the current through R.

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HARD
JEE Main/Advance
IMPORTANT

The resistance of each resistor in the circuit diagram shown in figure is the same and equal to R=1 Ω. The voltage across the terminals is U = 7 V. Determine the current i (Ampere) the leads if their resistance can be neglected.

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