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Review questions

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This activity contains 20 questions.

Question 1.
ch7a.jpg

Identify where the energy comes from in this simple electrical circuit.

 
End of Question 1


Question 2.
ch7b.jpg

In this diagram the names for three symbols have been replaced with the letters X, Y and Z. List the names for these three symbols respectively.

 
End of Question 2


Question 3.
Recall the term used to explain the measure of how much a load restricts and reduces the flow of current in a circuit.

 
End of Question 3


Question 4.
ch7c.jpg

A water pump can be used as an analogy of an electrical circuit. Clarify what the valve and water wheel represent respectively.

 
End of Question 4


Question 5.
Identify the unit used to measure the resistance in an electric circuit.

 
End of Question 5


Question 6.
Explain what would happen with an increase in resistance in an electric circuit.

 
End of Question 6


Question 7.
ch7d.jpg

Consider this diagram showing an electric circuit. Predict what would happen if one of the 3-volt globes were to burn out.

 
End of Question 7


Question 8.
ch7e.jpg

Consider this diagram showing an electrical circuit. Predict what would happen if one of the 6-volt globes were to burn out.

 
End of Question 8


Question 9.
The lights on a Christmas tree are arranged in a particular order. Often when one globe fails, the remainder of the lights do not light up. Recall how lights in such a circuit are arranged.

 
End of Question 9


Question 10.
Identify which of the following equations is not an expression of Ohm's Law, in which V = voltage, R = resistance and I = current?

 
End of Question 10


Question 11.
Explain what occurs when the voltage in an electrical circuit doubles.

 
End of Question 11


Question 12.
ch7f.jpg

This diagram shows a series circuits with two identical light bulbs. Calculate the resistance of each light globe.

 
End of Question 12


Question 13.
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This diagram shows the magnetic field from loops of wire around an iron core. Identify which of the following would not have any effect on the strength of the electromagnet produced.

 
End of Question 13


Question 14.
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This diagram shows the operation of an electric bell. In this circuit, identify when the current will flow.

 
End of Question 14


Question 15.

ch7i.jpg

This diagram shows how a current can be produced in a coil of wire. The arrow on the wire shows the direction the current flows as the north pole of the magnet moves closer to the coil of wire. Explain when this direction will remain the same.

 
End of Question 15


Question 16.
ch7k.jpg

This diagram shows the steps in the path of electricity from a power station to a house. Identify why transformers are used.

 
End of Question 16


Question 17.
ch7j.jpg

There are two main kinds of waves, as shown in this diagram. List the order of the missing words from P to S.

 
End of Question 17


Question 18.
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This diagram shows the sensitivity of the eyes to various colours. Identify the colour that has a wavelength of about 570 nanometres

 
End of Question 18


Question 19.
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This diagram shows the behaviour of different types of radio waves. Identify the types of radio waves that can 'bounce off' space satellites.

 
End of Question 19


Question 20.
ch7n.jpg

This table shows the maximum number of two-way conversations that can be had using different methods of transmission. Identify which of the following statements is true.

 
End of Question 20





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