Question

Calculate the heat dissipated in the circuit in 1 minute.

• A. 30 J
• B. 45 J
• C. 75 J
• D. 150 J

Answer 1

The correct option is D 150 J

Given,
time (t) = 1 minute = 60 seconds
The two resistors are in series. So, the equivalent resistance is:
$R_{eq}=6\Omega +4\Omega$
$R_{eq}=10\Omega$

Power used is:
$P=\frac{V^2}{R_{eq}}$
$P=\frac{5^2}{10}=2.5W$

Energy consumed in 60 seconds is:
$E=Pt$
$E=2.5\times 60=150J$