A toaster consists of 4 heating elements that are connected in parallel. The toaster is connected to a 240 V mains supply. When the toaster is switched on, a current of 2.5 A is drawn from the mains supply.
Calculate the electrical energy used by a single heating element in the toaster when it is turned on for 2 minutes.
Thanks in advance.
To calculate the electrical energy used by a single heating element in the toaster, you need to know the power rating of the toaster.
The power (P) is the product of the current (I) and voltage (V):
P = I * V
In this case, the current drawn from the mains supply is 2.5 A, and the voltage is 240 V. So:
P = 2.5 A * 240 V
P = 600 W
The power rating of the toaster is 600 Watts.
To calculate the electrical energy used, you can use the formula:
Energy (E) = Power (P) * Time (t)
In this case, the time is given as 2 minutes, but it needs to be converted to hours since the power is given in Watts:
Time in hours = 2 minutes / 60 minutes per hour
Time in hours = 0.033 hours
Now, let's calculate the energy used by a single heating element:
E = P * t
E = 600 W * 0.033 hours
E ≈ 19.8 Wh
Therefore, a single heating element in the toaster uses approximately 19.8 Watt-hours of electrical energy when turned on for 2 minutes.