Question

11. The number of joules contained in 1 kWh is
(a) 36 x 105)
(b) 3.6 x 107
(c) 36 x 10]
(d) 3.7 x 107 )​

Answer 1

The number of joules in a kilowatt  are -  1 kilowatt  = 3.6 x 10 to the power of 6 = 3.6 x 1000000 joules = 36000000 joules.

The joule can also be called as J ( symbol of joule ) .

The kilowatt can also be called as kWh ( symbol of kilowatt ).

The kilowatt-hour is a composite unit of energy equal to one kilowatt (kW) of power sustained for one hour. Expressed in the standard unit of energy in the International System of Units (SI), the joule (symbol J), it is equal to 3600 kilojoules (3.6 MJ).[1][2]

The hour is a unit of time listed among the non-SI units accepted by the International Bureau of Weights and Measures for use with the SI.[3] Its combination with the kilowatt, a standard SI unit, is therefore permitted within the standard.

The joule   is a derived unit of energy in the International System of Units.[4] It is equal to the energy transferred to (or work done on) an object when a force of one newton acts on that object in the direction of the force's motion through a distance of one metre (1 newton metre or N⋅m). It is also the energy dissipated as heat when an electric current of one ampere passes through a resistance of one ohm for one second. It is named after the English physicist James Prescott Joule (1818–1889).[5][6][7]

Answer 2

Concept

A kilowatt hour is the amount of energy produced in one hour by a kilowatt power source.

Find

We are asked to find the number of joules contained in 1 kWh

Solution

$1 kWh=1Kw*1hour=1000*3600 Ws$

⇒$1 kWh=3.6*$$10^{6} J$

Hence the number of joule contained in 1 kWh is $3.6*10^{6} J$.

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