CAPE Physics Unit 2 · 2007 · Paper 1 · Question Q18
A direct current (I) dissipates power in a resistor (R). A sinusoidal alternating current dissipates the same power in another resistor of one quarter the value. What is the r.m.s. value of the alternating current?
- (A)
\frac{I}{4} - (B)
\frac{I}{\sqrt{2}} - (C)
\sqrt{2}I - (D)
2I
The answer is shown once you've answered.
Practise this question