A 50 microfarad capacitor charges through a 5 kilohm resistor. What is the time constant of the circuit?
Answer and explanation
Correct answer: B. 0.25 s
- Step 1: The time constant is tau = R C.
- Step 2: tau = 5000 ohm x 50e-6 F = 0.25 s.
Answer
0.25 s.
Why not the others: The other values come from mistakes converting kilohms and microfarads to ohms and farads.
Practise more Electricity.
Free questions with an explanation for every one, and full timed Bagrut (Secondary School Matriculation) mock tests.
More Electricity questions
- Two resistors of 20 ohms and 30 ohms are connected in parallel. What is the equivalent resistance?
- A 10 ohm heater carries a current of 3 A. What power does it dissipate?
- Two point charges of 3 microcoulomb and 2 microcoulomb are 0.1 m apart in vacuum. What is the force between them? (k = 9 x 10^9 N m^2 / C^2)
- A 20 microfarad capacitor charges through a 20 kilohm resistor. What is the time constant of the circuit?
- Two resistors of 6 ohms and 12 ohms are connected in parallel. What is the equivalent resistance?
- A 20 ohm heater carries a current of 3 A. What power does it dissipate?