Physicshard · Past Paper
In a transformer, if the efficiency is 80%, input power is 1000W, and output voltage is 200V, find the output current.
A5 A
B4 A
C10 A
D0.8 A
✓ Correct Answer: B — 4 A
Efficiency = P_out / P_in. 0.8 = P_out / 1000 => P_out = 800W. I_out = P_out / V_out = 800 / 200 = 4 Amperes.
Share this question
More from Physics
- Which metal is used as a filament in an incandescent electric bulb?
- Which of the following is an example of renewable energy?
- If a circuit is powered by 220V and the current is 0.2A, what is the power consumed in Watts?
- When a ray of light enters a glass prism, it undergoes:
- A convex lens forms a real image of a point object at a distance of 50 cm. If the object is at 50 cm, what is the power?