Download Homework - Electricity

Homework 1
Current, voltage, resistance & power
1) Copy and complete :
In an electrical circuit a c_____ flows. Current is a flow of particles
called e_____. E_____ is carried around an electrical circuit by
e_____. V____ is a measure of the e_____ given to the electrons.(3)
2) What is Power ?
(1)
3) Describe where you can find the power rating of an appliance.
(1)
4) If an appliance is rated at 500W, comment on its energy use.
(1)
5) If an appliance is rated at 3kW, comment on its energy use.
(1)
6) What unit is resistance measured in ?
(1)
7) State TWO advantages of using energy saving light bulbs.
(2)
8) Which of these appliances would have the HIGHEST power rating ?
a) Television
b) Electric cooker
c) Fridge
9) Explain your answer for the previous question.
(1)
(1)
10) Name TWO other appliances that have very large power ratings. (1)
11) What do most high power appliances have in common ?
(1)
12) Name TWO appliances that have low power ratings.
(1)
Total = 15 marks
Homework 2
Electrical and electronic circuits
1) Draw the circuit symbols for the following components :
a) Bulb
b) Resistor
c) Battery
d) Fuse
(2)
2) Give TWO reasons why everyone should use the same symbols. (2)
3) Describe this circuit in words, starting from the negative terminal of
the battery :
A
V
(1)
4) Explain how to place an Ammeter in a circuit to measure current. (1)
5) Explain how to place a Voltmeter in a circuit to measure voltage. (1)
6) Copy and complete :
Voltage is measured in v______. 2kV is _______ volts.
Current is measured in a______. 20mA is _______ amps.
(2)
7) What can you say about the current at all points in a series circuit ?(1)
8) Write your previous answer mathematically (hint, use I for current). (1)
9) What can you say about the voltage in a series circuit ?
(1)
10) Write your previous answer mathematically (hint, use V for voltage).
(1)
11) Name THREE electronic input devices.
(1)
12) Name THREE electronic output devices.
(1)
Total = 15 marks
Homework 3 – test revision
(all questions are worth 1 mark)
Current, voltage, resistance and power …..
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
Name the particle that carries energy around an electrical circuit.
What is current ?
What quantity is a measure of the energy that electrons have ?
If the resistance is very high, is the circuit current low or high ?
Where would you find the power rating of an appliance ?
A light bulb is rated at 100W, what does this mean ?
Convert the following into watts : a) 5kW, b) 500kW, c) 0.5kW
Name THREE appliances that have very high power ratings.
What do these THREE appliances have in common ?
Name TWO advantages of using energy saving light bulbs.
Electrical and electronic circuits …..
1)
2)
3)
4)
5)
6)
7)
8)
What are TWO advantages of using circuit symbols ?
What is an ammeter used for ?
Explain how an ammeter can be used to measure current ?
What is a voltmeter used for ?
Explain how a voltmeter can be used to measure voltage ?
Convert the following into amps : a) 10mA, b) 105mA, c) 0.5mA
In a series circuit, what can you say about the value of current ?
In a series circuit, what does the voltage across each appliance add
up to ?
9) Name TWO applications of electronic circuits ?
10) Switching devices are also known as process devices, name
THREE switching devices.
Electromagnetism …..
1)
2)
3)
4)
5)
What happens if you place two similar poles of a magnet together ?
Name FIVE devices that use magnetism to work.
What are TWO advantages of using an electromagnet ?
Describe how you could show the magnetic field around a magnet.
Name TWO sound emitting devices that use an electromagnet.