1. In an electrical circuit two resistors of 2 Ω and 4 Ω respectively are connected in series to a 6 V battery.
The heat dissipated by the 4 Ω resistor in 5 s will be
(a) 5 J
(b) 10 J
(c) 20 J
(d) 30 J

Question

1.	In an electrical circuit two resistors of 2 Ω and 4 Ω respectively are connected in series to a 6 V battery.
The heat dissipated by the 4 Ω resistor in 5 s will be
(a)	5 J
(b)	10 J
(c)	20 J
(d)	30 J

Accepted Answer

Answer is (c) 20 J
Explanation:
Equivalent resistance of the circuit is R = 4+2 = 6Ω current, I= V/R) 6/6= 1A
the heat dissipated by 4 ohm resistor is, H = IRt = 20J

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