## When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.

Q.8:- When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor….

## The values of current I flowing in a given resistor for the corresponding values of potential difference V across the resistor

Q.7:- The values of current I flowing in a given resistor for the corresponding values of potential difference V across the resistor are given below − I (Amperes) 0.5 1.0 2.0 3.0 4.0 V (volts) 1.6 3.4 6.7…

## A copper wire has diameter 0.5 mm and resistivity of 1.6 × 10–8 Ω m. What will bethe length of this wire to make its resistance 10 Ω? How much does the resistancechange if the diameter is doubled?

Q.6:- A copper wire has diameter 0.5 mm and resistivity of 1.6 × 10–8 Ω m. What will bethe length of this wire to make its resistance 10 Ω? How much…

## How is a voltmeter connected in the circuit to measure the potential difference between two points?

Q.5:- How is a voltmeter connected in the circuit to measure the potential difference between two points?   Answer:- A voltmeter must always be connected in parallel to measure the potential…

## Two conducting wires of the same material and of equal lengths and equal diametersare first connected in series and then parallel in a circuit across the same potentialdifference.

Q.4:-  Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential…

## An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, thepower consumed will be (a) 100 W (b) 75 W (c) 50 W (d) 25 W

Q.3:-  An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, thepower consumed will be –(a) 100 W (b) 75 W (c) 50…

## A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel

Q.1:- A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R’,…

## Which of the following terms does not represent electrical power in a circuit?

Q.2:- Which of the following terms does not represent electrical power in a circuit? (a) I2R (b) IR2 (c) VI (d) V2/R   Answer:- (b) Power cannot be represented by IR2.