Question

Mention the commercial unit of energy. Express in terms of joules. Calculate the energy in joule consumed by a device of 60 watt in 1 hour.

Answer 1

the comercial unit of energy is kwh
1kwh=3.6x10⁶J
power=work/time
60=work/1
∴work=60x1=60J

Answer 2

Explanation:

• The commercial unit of energy is kilowatt-hour. It is written as kWh.
• The elation between kWh and joules is given by :

$1\ kWh=3.6\times 10^6\ J$

Here,

Power of device, P = 60 watt

Time, t = 1 hour = 3600 s

Power is given by :

$P=\dfrac{E}{t}$

E is energy consumed

$E=P\times t\\\\E=60\times 3600\\\\E=216000\ J\\\\E=2.16\times 10^5\ J$

So, the energy consumed by the device is $2.16\times 10^5\ J$.

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