Physicshard · Past Paper
What is the current in a circuit containing a 12V battery and three 4-Ohm resistors connected in parallel?
A1 A
B3 A
C9 A
D12 A
✓ Correct Answer: C — 9 A
R_eq = 4/3 Ohms. I = V / R_eq = 12 / (4/3) = 12 * 3 / 4 = 9 Amperes.
Share this question
More from Physics
- A heater is rated 220V, 2200W. What is the current drawn by it?
- Two resistors are in parallel. If one resistor is removed, what happens to the total resistance of the circuit?
- The instrument used to measure electric current in a circuit is called a/an:
- A solenoid of length 0.5m has 500 turns. If 2A current flows, calculate the magnetic field strength (take μ₀ = 4π x 10^-7 T m/A).
- A ray of light is incident on a glass slab. If the angle of incidence is 45 degrees and the angle of refraction is 30 degrees, what is the refractive index?