Figure 14 shows a circuit in which a battery, a switch, a bulb, a resistor P, a variable resistor

      

Figure 14 shows a circuit in which a battery, a switch, a bulb, a resistor P, a variable resistor C a voltmeter V and two ammeters A and A of negligible resistance are connected. P has resistance of 10 ohms. When the switch is closed a reads 1.5 V.
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Determine;
(i) The current passing through P;
(ii) The resistance of the bulb.

  

Answers


John
(i) I = $\frac{V}{R}$ = $\frac{1.5}{10}$ = 0.15 A

(ii) Voltage across the bulb = 1.5 V

R = $\frac{V}{I}=$\frac{1.5}{0.1}$ = 15 ohms
johnmulu answered the question on May 23, 2017 at 13:43


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