P1 Flashcards
(7 cards)
1
Q
What are the 3 types of heat transfer?
A
Conduction, Convection, Radiation
2
Q
A petrol engine produces 300kJ of useful energy for every 1,000kJ of chemical energy it uses; what is its efficiency?
A
0.3
3
Q
Which of the following describes the correct relationship between energy, input and output?
A
Efficiency = Useful energy output / Total energy input
4
Q
What is the unit for power?
A
Watts
5
Q
In this circuit, if the battery produces 1.5V and the lamp uses 1V, how much voltage will the resistor have across it?
A
0.5V
6
Q
Which of the following equations describes the relationship between power, work and time?
A
Power = Work done / Time taken
7
Q
Which of the following is the correct equation for the relationship between power, current and voltage?
A
Power = Current x Voltage
