A-LevelPhysicsD.C. circuits9702/12 · Oct/Nov 2018 · Q341 Mark
An electrical device of fixed resistance 20 Ω is connected in series with a variable resistor and a battery of electromotive force (e.m.f.) 16 V and negligible internal resistance. [Figure 34.1] What is the resistance of the variable resistor when the power dissipated in the electrical device is 4.0 W?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
A16 Ω
B36 Ω
C44 Ω
D60 Ω
✓ Correct answer
A: 16 Ω
Practise more questions on this topic
Oracle Prep sorts past-paper questions by topic, so you can drill D.C. circuits and see which topics are most likely to come up next.
Sign up free →