P2 power of electrical appliances

Question 1

What is the formula to calculate power in an electrical appliance?

Answer 1

Power (P) is calculated using the formula P = VI, where V is voltage and I is current.

Question 2

True or False: The unit of power is the watt (W).

Answer 2

True.

Question 3

Fill in the blank: The power of an appliance is the rate at which it __________ energy.

Answer 3

converts.

Question 4

What does the term ‘efficiency’ refer to in the context of electrical appliances?

Answer 4

Efficiency refers to the ratio of useful output energy to the input energy.

Question 5

If an appliance uses 1000 watts for 2 hours, how much energy does it consume in kilowatt-hours?

Answer 5

It consumes 2 kilowatt-hours (kWh).

Question 6

What is the relationship between power, voltage, and current?

Answer 6

Power is directly proportional to both voltage and current.

Question 7

Multiple Choice: Which of the following is NOT a unit of power? A) Watt B) Joule C) Horsepower

Answer 7

B) Joule.

Question 8

True or False: Higher power ratings indicate that an appliance is more energy-efficient.

Answer 8

False.

Question 9

What does a higher power rating on an appliance usually indicate?

Answer 9

It usually indicates that the appliance consumes more energy when in use.

Question 10

How can the power of an appliance be decreased without changing its voltage?

Answer 10

By decreasing the current flowing through the appliance.