1. Name ………………………………………………………. Date ………………….
Chapter 4: Scientific principles
Basic principles for energy, heat and power
Temperature, changes of state, and units of energy and heat are important concepts, but
how much do you really know about them? Answer the following questions about the basic
principles for energy, heat and power.
1 There are various devices for measuring temperature. Identify each of them by
completing this table.
Device Description
a) Metallic strip that breaks an electrical circuit
b) Glass tube containing mercury and alcohol
c) Bi-metallic strips used in commissioning central heating
systems
d) Probe, which can be connected to a thermistor
2 Where does convection occur?
a) In metals
b) In gases and liquids
c) In gases only
d) In copper piping
3 Heat is which of the following?
a) Temperature
b) Measure of hotness or coldness
c) Total energy associated with the motion of molecules
d) Total energy associated with friction
4 1 W (watt) is equal to which of the following?
a) 1 joule per minute
b) 1 joule per second
c) 1 kg heated up to 5 °C
d) 2 °C heat increase or decrease
© Nelson Thornes Ltd 2012 1
Level 1
Worksheet 5