a light bulb is on for 15 seconds and during that time it using 1200 joules of electriciity energy
Answers
Answer:
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Explanation:
The formula that links energy and power is:
Energy = Power x Time.
The unit of energy is the joule, the unit of power is the watt, and the unit of time is the second.
If we know the power in watts of an appliance and how many seconds it is used we can calculate the
number of joules of electrical energy which have been converted to sortie other form.
E.g. If a 40 watt lamp is turned on for one hour, how many joules of electrical energy have been
converted by the lamp?
Energy (w) = Power x Time
Energy = 40 x 3600
= 14,400 joules
Note: if an appliance has a rating of one watt it means it converts one joule of electrical energy to some
other form every second.
Because the joule is such a small unit, quantities of energy are often given in kilojoules.
I.e, thousands of joules.
Therefore the above answer could be written as 14.4 kJ.
The Kilowatt Hour (kWh)
Because the joule is so small, electrical energy supplied to consumers is bought by the UNIT. The UNIT
is the kilowatt hour (kWh). One kilowatt hour is the amount of energy that would be converted by a one
thousand watt appliance when used for one hour
Example
A consumer uses a 6 kW immersion heater, a 4 kW electric stove and three 100 watt lamps for 10 hours.
How many units (kWh) of electrical energy have been converted.
Total power in kilowatts = 6 + 4 + 300/1000.
= 10.3kW.
Energy in kilowatt hours = Power in watts x time in hours
=10.3 x 10
= 103 kilowatt hours
Electrical supply authorities use the kWh as the unit for measuring electrical energy to householders
Explanation:
energy=power x time
energy=1200×15
18000
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