Page 160 - Science Coursebook

Unit 10
Unit 10 End of unit questions

10.1 Two plastic balls, A and B, are hung side by side on threads, as shown.
The balls are given an electrical charge.

The table shows the charges given to each ball in two separate experiments.

Charge of ball A Charge of ball B Attract/repel?
Experiment 1 positive negative
Experiment 2 negative negative

a Copy the table and complete the last column to show whether you would
expect the balls to attract or repel one another. [2]
In a third experiment, ball A is given a negative charge. A polythene rod is
charged by rubbing it with a cloth. It repels ball A.
b What force causes the rod to become charged? [1]
c What charge does the rod have, positive or negative? [1]
d What particles are transferred from the cloth to the rod when it becomes charged? [1]

10.2 The table shows the circuit symbols for four different components A–D.

V
A B C D
V M

V
a Name each of the components A–D. M [4]
b Draw a diagram to represent a circuit in which two 1.5 V cells are connected
in series with a single resistor. M [2]
V
c Draw arrows on your circuit diagram to show the direction of the current
in the circuit. [1]
M
d What will be the combined voltage of the two cells? [1]

158 10 Electricity