List of top Science Questions on Electric Power asked in CBSE Class X

An electric heater of resistance 8 Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.
Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes?
Compare the power used in the 2 Ω resistor in each of the following circuits:
  1. a 6 V battery in series with 1 Ω and 2 Ω resistors,
  2. a 4 V battery in parallel with 12 Ω and 2 Ω resistors.
An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be –
Which of the following terms does not represent electrical power in a circuit?