Question

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 ______.

Options

• 5 J

• 10 J

• 20 J

• 30 J

Answer 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 20 J.

Explanation:

Total resistance of the combination

R_s = 2 + 4 = 6 Ω

Current, I = `"V"/("R"_"s") = 6/6` = 1

Heat dissipation in 4 Ω resistor,

H = I²Rt = 1² × 4 × 5 = 20 J