Electrical Energy and Power — MCQ Practice
Interactive MCQ Practice
Test your knowledge. Click “Solve” to reveal options, select your answer, then check the result. 6 questions available.
An electric heater is rated 1500 W, 220 V. If it operates for 2 hours, what is the electrical energy consumed in kilowatt-hours?
Two electric bulbs are rated (220V, 60W) and (220V, 100W) respectively. If they are connected in series across a 220V supply, which bulb will glow brighter?
A current of flows through a resistor for . Calculate the heat produced in the resistor.
An electric motor of efficiency 80% draws a current of from a 220V supply. What is the useful mechanical power output of the motor?
A resistor of resistance dissipates power when a current flows through it. If the current is doubled, what will be the new power dissipated?
A 100W, 220V bulb is connected to a 110V supply. Assuming its resistance remains constant, what is the actual power consumed by the bulb?