
An ammeter and a voltmeter are joined in series to a cell. Their readings are and , respectively. If a resistance is now joined in parallel with the voltmeter,


Important Questions on Current Electricity


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

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

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


In the circuit shown below, and. Find potential difference between the points and with disconnected.
If is short-circuited and the point is connected to point by a zero resistance wire, find the current through .

The resistance of each resistor in the circuit diagram shown in figure is the same and equal to The voltage across the terminals is Determine the current (Ampere) the leads if their resistance can be neglected.
