What is the commercial unit of electrical energy used on domestic electricity bills?

PHYSICS · Single correct · CBSE · Physics · Electricity · Electricity

Problem

What is the commercial unit of electrical energy used on domestic electricity bills? (a)

1\,\text{watt\,hour}

(b)

1\,\text{kilowatt\,hour}

(c)

1\,\text{joule}

(d)

1\,\text{kilowatt\,second}