Q.1.
A wind turbine generates 100 joules of electricity from a gust of wind which has 300 joules of energy. How efficient is the turbine?
Q.2.
During an energy transfer, only part of it may be usefully transferred. What happens to the remainder of the unused energy?
Q.3.
What happens to wasted energy?
Q.4.
What cannot be done to energy?
Q.5.
A solar panel is 20% efficient at converting light energy into electricity. If it generates 200 joules of electrical power, how much power is wasted?
Q.6.
What can be done to energy?
Q.7.
Which formula can be used to calculate the percentage of energy transferred by a device?
Q.8.
Calculate the efficiency of a heater which can convert 700 joules of chemical energy into 175 joules of heat energy.
Q.9.
Which formula can be used to calculate the percentage of power transferred by a device?
Q.10.
An LED converts around 80% of the energy supplied to it into light. How much energy is converted into light if a total of 50 J is supplied to it?