Question

(a) Write down the formula which relates electric charge, time and electric current
(b) A radio set draws a current of 0.36 A for 15 minutes. Calculate the amount of electric charge that flows through the circuit.

Answer 1

Answer:

1. current = charge / time  ---- (i)

2. 32.4

Explanation:

0.36 = charge / 90  -----(from i)

charge = 0.36x90

charge = 32.4

Answer 2

Amount of Electric Charge is 324 Coulombs

Explanation:

(a) If a charge of Q coulombs flows through a conductor in time t seconds, the magnitude, I of the electric current flowing through it is given by:

$I = \frac {Q}{t}$

b.) Given,

• Current, I = 0.36 A

• Time Taken, t = 15 minutes = $15 \times 60$ = 900 seconds (As 1 minute = 60 seconds)

Using the above formula,

$I = \frac {Q}{t}$

or $Q = I \times t$

= $0.36 \times 900$

= 324 C

Thus, the amount of electric charge that flows through the circuit is 324 C.