Exercises 2.2
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Transcript of Exercises 2.2
Chapter 2 Electricity Date:__________________
Exercises:1. Diagram 4.1 shows a circuit used to investigate the
relationship between current and potential difference across a constantan wire s.w.g 24 with length of 10 cm.
(a)Name the measuring instruments labelled X and Y in
Diagram 4.1.
X = .................................. Y = ..................................(b) (i) What is the relationship between the reading of
the measuring instruments X and Y?
................................................................................(ii) State the physics law involved in 4(b)(i).
................................................................................(c) The experiment is repeated by using a constantan
wire s.w.g 36 with the same length. Diagram 4.2 shows the graph V against T for the experiment.
................................................................................
Based on graph in Diagram 4.2;(i) What is the physical quantity represented by the gradient
of the graph?
................................................................................ (ii) Which of the constantan wire has the highest resistance?
................................................................................
2. Diagram 2.1 shows two constantan wires P and Q of the same length but of different cross-sectional area, being used to carry out an experiment.
Initialy, the experiment
is carried out with P placed across XY. After that, P is replaced with Q and
the experiment is repeated. The V-I graph in Diagram 2.2 shows the results obtained from the experiment.
a)a)a)a)a)
Based on Diagram 2.1, compare the cross sectional area of wires P and Q.
................................................................................b) Based on Diagram 2.2:
(i) State how the resistance of the constantan wire can be obtained.
................................................................................ (ii) Determine the resistance of conductor Q. Show on
your graph.
3. The electrical components in our household appliances are connected in a combination of series and parallel circuits. (pg58)
The above figure shows a hair dryer which has components connected in series and parallel. Describe how the circuit works.
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