Question

What is one unit of household electrical energy in J?

• A. $1000J$
• B. $3600J$
• C. $0.6\times {10}^{3}J$
• D. $3.6\times {10}^{6}J$

Answer 1

The correct option is D $3.6\times {10}^{6}J$

One unit of household is $1kwh$

$kwh=$ kilo watt hour

$1\text{unit}$$=1kWh$

$\Rightarrow 1\text{unit}={10}^{3}W\times 3600s$

$\Rightarrow 1\text{unit}=3.6\times {10}^{6}J$