Physics 2001 JAMB Past Questions - Question 31: A bread toaster uses a current of 4A when plugged in a 240 volts line. It takes one minute to toast slices of bread. What is the energy consumed by the toaster?

Correct Answer

A

Explanation

Energy =IVt=4*240*1*60=57600JTo calculate the energy consumed by the toaster, you can use the formula for electrical energy:

Energy (in joules) = Power (in watts) × Time (in seconds)

First, you need to find the power (P) in watts, which can be calculated using the formula:

Power (P) = Voltage (V) × Current (I)

In this case, the voltage is 240 volts, and the current is 4 amperes.

Power (P) = 240 V × 4 A = 960 watts

Now, you have the power (P) in watts, and you know that it takes one minute to toast the bread. However, you need to convert the time to seconds because the power is in watts, and time should be in seconds.

1 minute = 60 seconds

Now, you can calculate the energy consumed:

Energy = Power × Time
Energy = 960 watts × 60 seconds

Energy = 57,600 joules

So, the toaster consumes 57,600 joules (or 57.6 kJ) of energy to toast the bread.