an electric heating element is conneceted to a 110V circuit and a current of 3.2 a is flowing through the element. How much energy is used up during a period of 5 hours by the element?
Energy= Power * time= VI*time
convert 5 hrs to seconds, and energy will be in joules.
If you leave time in hours, you can get energy in watt-hours, and convert that answer to kilowatt-hours if you wish.
1760
To calculate the energy used by the heating element, you can use the formula:
Energy = Power × Time
In this case, we need to determine the power (P) of the heating element. The power can be found using the formula:
Power = Voltage × Current
Given that the voltage (V) is 110V and the current (I) is 3.2A, we can substitute these values into the formula to find the power:
Power = 110V × 3.2A
Power = 352W
Now that we have the power, we can calculate the energy used (E) over a period of 5 hours:
Energy = Power × Time
Energy = 352W × 5h
Energy = 1760Wh
So, the heating element will use up 1760 watt-hours (Wh) of energy during a period of 5 hours.