Question

Suppose a DC power source with a voltage of 45 volts is connected to a 15 Ω load. How much power will this load dissipate?

Answer 1

Explanations & Calculations

• This could easily be calculated using the relationships p = Vi & V = iR for a resistive load.

$\qquad\qquad \begin{aligned} \small p & = \small V \times i \,\,\, \text{and} \,\,\, i = \frac{V}{R}\\ \small p & =\small \frac{V^2}{R}\\ &= \small \frac{45^2V}{15\Omega}\\ &= \small \bold{135W} \end{aligned}$