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 8
Explain why it is important to use energy-efficient appliances at home.
What does the term 'power rating' of an electrical appliance mean?
What is the formula for electrical power in terms of voltage and current?
What is the relationship between power, voltage, and resistance?
A television set is rated at 120 W. If it is used for 3 hours daily for 30 days, what is the total energy consumed in kWh?
If a refrigerator uses 2 kWh of energy per day, how much energy does it use in a 30-day month?
Which formula can be used to calculate electrical energy consumed?
(1) Energy = Power × Time
(2) Energy = Voltage × Current
(3) Energy = Current × Resistance
(4) Energy = Power / Time
Which of the following appliances uses the most electrical energy if all are used for 1 hour?
(1) 60 W fan
(2) 100 W bulb
(3) 200 W heater
(4) 40 W lamp
Which of the following best describes electrical energy?
(1) The rate at which current flows
(2) The total amount of work done by an electric current
(3) The force that pushes electrons
(4) The resistance in a circuit
Which of the following is a correct unit for measuring power?
(1) Joule/second
(2) Ampere
(3) Volt
(4) Ohm
Which of the following is NOT a factor that affects the total energy consumed by an appliance?
(1) Power rating
(2) Time of use
(3) Color of the appliance
(4) Voltage supplied
Which of the following is NOT a unit of power?
(1) Watt
(2) Kilowatt
(3) Joule
(4) Megawatt
Fill in the blank: 1 kilowatt (kW) is equal to __________ watts (W).
Fill in the blank: 1 kWh is equal to __________ Joules.
Fill in the blank: Power is the __________ at which work is done or energy is transferred.
Fill in the blank: The energy consumed by an appliance is equal to its power multiplied by the __________ it is used.
True or False: A device with higher power rating consumes more energy per second than a device with lower power rating.
True or False: Power can be calculated by dividing energy by time.
True or False: Reducing the time an appliance is used will reduce the total energy consumed.
True or False: The energy consumed by an appliance depends only on its power rating.
