Question

A potential difference of 40v is applied across a resistance of 8 for a period of 2 minutes. What current is drawn? Calculate the charge which passes through the resistor.

Answer 1

this is your answer.....hope it helps.......

Answer 2

Given :

Potential difference (V) = 40 V

Resistance (R) = 8 ohm

Time (T) = 2 min = 2×60 sec = 120 sec

To Find :

(a) Current

(b) Charge passed through the resistor

Solution :

(a) According to Ohm's Law,

    Potential Difference (V) = Current (I) × Resistance (R)

or, Current (I) = $\frac{Potential Difference(V)}{Resistance (R)}$

∴ Current (I) = $\frac{40}{8}$

                    = 5 A

Hence, the current drawn is 5 A.

(b) Charge passing through the resistor (Q) = Current (I) × Time (T)

                                                                        = 5 × 120

                                                                        = 600 C

Therefore, the charge passing through the resistor in 2 min is 600 C.