Electrical Power and Energy
Physics ⇒ Electricity and Magnetism
Electrical Power and Energy starts at 8 and continues till grade 12.
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See sample questions for grade 10
Explain why electrical energy is transmitted at high voltages over long distances.
If a bulb is rated 100 W, what does this rating mean?
If a device uses 2 kW of power for 3 hours, how much energy does it consume in kWh?
If the voltage across a resistor is doubled, what happens to the power dissipated by the resistor (assuming resistance is constant)?
If two bulbs of 60 W and 100 W are connected in parallel to a voltage supply, which bulb will glow brighter?
A 60 W bulb and a 100 W bulb are connected in series to a 220 V supply. Which bulb will glow brighter?
A student claims that two appliances with the same power rating will always consume the same amount of energy. Is this statement true or false? Explain your answer.
If the resistance of an electric heater is doubled while keeping the voltage constant, what happens to the power consumed?
