Q1. In a circuit, resistors of 2 ohms and 4 ohms are connected in parallel across a cell supplying a potential difference of 6 volts. Another resistor of 5 ohms is connected in series with the cell. 


(a) Draw the circuit.


(b) Calculate the total resistance in the circuit.


(c) Calculate the current flowing through the 5 ohm resistor.



Q2. This question involves calculating the resistance of resistors in series and in parallel.Given three resistors of resistance 2 ohms, 5 ohms and 10 ohms respectively....


(a) Draw a circuit showing the resistors (a) in series  and (b) in parallel.


(b) Calculate the total resistance of the circuit where the resistors are in series.


(c) Calculate the total resistance of the circuit where the resistors are in parallel.


(d) In which arrangement will the current in the circuit be larger? Explain your answer.



Q3. A parallel circuit is constructed as shown. When the switch is closed the ammeter A reads 0.75A



(a) Calculate the potential difference shown by voltmeter V


(b) The total current in the circuit is 2.0A, calculate the resistance of the filament lamp.


(c) Is the total resistance of the circuit more than, or less than, or equal to, the answer you gave in (b) ?


Q4. Study the circuit diagram shown below:



(a) If the switch "S" is open, ammeter A read 0.70 A. Find the potential difference across the battery.


(b) If the switch "S" is closed, ammeter A reads 0.50 A.


(i) Find the potential difference across lamp B


(ii) Find the potential difference across resistor R2


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