Exam 11: Energy, Work, Heat and Power

The 'efficiency' of a motor, or any other electrical machine, is equal to

The term 'power loss', when applied to a transmission cable, actually refers to

The 'power rating' of an electric motor refers to its

The sum-total of all the energies associated with the molecules that make up a body is called its

What will happen to the power of a fixed resistance if the current through it is halved?

What is meant by the term 'windage loss', when applied to a rotating machine?

A 100-W/230-V lamp is connected in series with a 60-W/230-V lamp, across a 230-V supply. Which lamp will be the brightest?

How much power is supplied to a 100 W lamp over a period of 3 hours?

The difference between the work done on an electric kettle and the heat lost to the surroundings is equal to the

The rate at which energy is transferred from a warmer body to a cooler body is called

The rate at which one form of energy is converted into another form is called

A higher-wattage lamp has a __________ resistance than a lower-wattage lamp

The SI unit for heat transfer is the

The process by which energy is transferred from a warmer body to a cooler body is called

As a customer of your electricity supply company, your energy consumption is measured in

What will happen to the power of a fixed resistance if the applied voltage is doubled?

The SI unit for the rate of heat transfer is the

Which has the higher internal energy? A given mass of water at 100 degrees Celsius or the same mass of steam at 100 degrees Celsius?

If doubling the voltage causes the resulting current to double, what will happens to the power of the circuit?

The SI unit for energy is the