24 This unit’s symbol is


2 The unit for current is the This unit’s symbol is


3 The unit for resistance is the This unit’s symbol is


Voltage (V) Current (A)


0 0


ELECTRICITY


ACTIVITY 1: REVISION QUESTIONS 1 The unit for voltage is the


. . . . . .


4 A student carried out an investigation of Ohm’s Law for a simple resistor. Their results are shown in the following table.


0.5 1.5


1.0 3.0


1.5 4.2


2.0 6.5


2.5 7.6


a. Use the axes below to draw a graph of their results, making sure you draw a line of best fit.


Current (A)


b. From your graph, what voltage would be needed to generate a current of 2.0 A for this resistor? c. What current would be generated by a voltage of 3.0 V? Give reasons for your answer.


112 UNIT 7: WORKING WITH ENERGY


PHYSICAL WORLD


Voltage (V)


c


h


a


p


t


e


r


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