5. (20%) (a) A circuit is connected with R₁, R2, R3 and a light bulb as shown in Figure 5. Suppose the resistance of R₁,

[answerhappygod]

5 20 A A Circuit Is Connected With R R2 R3 And A Light Bulb As Shown In Figure 5 Suppose The Resistance Of R 1 (37.74 KiB) Viewed 29 times

5. (20%) (a) A circuit is connected with R₁, R2, R3 and a light bulb as shown in Figure 5. Suppose the resistance of R₁, R2 are 102 and 20 respectively. The ammeter reading is 1A. 5V Light bulb R₁ R₁ R. Figure 5. (i) If the light bulb is operating with a power of 3W. What is the resistance of the light bulb? (ii) Find R3. (iii) If an additional wire is connected from P to Q. Explain what will happen to the brightness of the light bulb. (iv) Sketch a diagram to indicate how to connect a voltmeter to measure the voltage across R3. (b) Explain whether it is better to connect household appliances in series or in parallel. (c) A steam turbine with Carnot efficiency of 0.39 takes in steam at a temperature of T °C and releases steam to the condenser at a temperature of 100 °C. Find T °C. A