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Gauteng=10841 Physical Science P1...
P.T.O.
PHYSICAL SCIENCES: PHYSICS
14
(PAPER 1) 10841/24
QUESTION 8 (Start on a new page.)
A battery with unknown emf and an internal resistance of \( 1 \Omega \) is connected to three resistors, a lightbulb, a high-resistance voltmeter, a switch, and an ammeter of negligible resistance, as shown below. The resistance of the lightbulb is \( 4 \Omega \) and the resistance of the three resistors are \( 2 R, R \) and \( 6 R \) respectively.
8.1 Define the term emf.
(2)
8.2 When switch \( \mathbf{S} \) is closed, the current through the ammeter is \( 0,2 \mathrm{~A} \) and the potential difference across \( \mathbf{R}_{1} \) is 6 V .
Write down the value of:
8.2.1 \( \quad V_{2} \)
(1)
8.2.2 The current through \( \mathbf{R}_{\mathbf{2}} \)
(1)
8.3 Calculate the resistance of \( \mathbf{R}_{3} \).
(3)
8.4 Calculate the value of the emf.
(6)
P.T.O.
PHYSICAL SCIENCES: PHYSICS
15
(PAPER 1)
10841/24
8.5 In a separate circuit, a variable resistor is connected to a battery with an