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….

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….

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…

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…

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…

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…

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…

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’,…

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.

Q. An electric motor takes 5 A from a 220 V line. Determine the power of the motor and the energy consumed in 2 h. Answers:- Given that electric…

Q. What determines the rate at which energy is delivered by a current? Answers:- The rate at which energy is delivered by a current is the power of the…