RRB Group-D Model Paper 15 with answers for online practice

CONCEPT:

• The rate of work done by the electric current is called as electric power.
• The difference in potential between two points is called a potential difference.
• Electric energy (E) = electric power (P) × time (t)

EXPLANATION:

• The commercial unit of electric energy is kilowatt or the Board of Trade (B.O.T) unit.
• One kilowatt-hour is defined as the electric energy consumed by the appliance of 1 kilowatt in one hour. Therefore option 1 is correct.

1 kilowatt-hour = 1 kilowatt × 1 hours = 1000 watt × 3600 s

1 kWh = 3600000 joules = 3.6 × 106 J