The unit for power in electricity should be watt. The power show how many energy transferred during a time and the SI unit would be joule per second.
The bill is charging for the amount of energy. The energy could be calculated by multiplying the power with time. In this case, the power in kilo watt will be multiplied by the duration in hour which make the kilowatt hour.
Gravity is a force which causes objects to fall or be still on the earth's surface. This invisible force has been longed explored mainly by many scientist however, Isaac Newton was first to conceptualize this into a proper principle.
GravityLight is a device that was recently developed by engineers that is designed to produce light through the force of gravity.
Answer: A
Explanation: The nervous system sends electric signals from the brain to the body to make they move. The charger is similar becuase it sends energy to your devices so they can work.
