Consider the circuits given below: 1. In which circuit are the lamps dimmest? 2. In which circuit or circuits are the lamps of equal brightness to the lamps in circuit? 3. Which circuit gives out the maximum light?

1. Circuit (ii). 2. Circuit (iii). 3. Circuit (iii).

Consider the circuits given below: 1. In which circuit are the la…

Question

Consider the circuits given below:

In which circuit are the lamps dimmest?
In which circuit or circuits are the lamps of equal brightness to the lamps in circuit?
Which circuit gives out the maximum light?

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Which of the fuels could be: (i) cooking gas (ii) alcohol (iii) wood (iv) hydrogen (v) kerosene?

Are the resistors connected in series with each other or in parallel?
For each resistor, state the p.d. across it.
The current flowing from the battery is shared between the two resistors. Which resistor will have bigger share of the current?
Calculate the effective resistance of the two resistors.
Calculate the current that flows from the battery.

Which appliance has the greatest electrical resistance? How does the data show this?
The lamp is connected to the mains supply by using a thin, twin-cored cable consisting of live and neutral wires. State two reasons why this cable should not be used for connecting the kettle to the mains supply.
Calculate the power rating of the kettle when it is operated from the 240V mains supply.
A man takes the kettle abroad where the mains supply is 120V. What is the current in the kettle when it is operated from the 120V supply?

Are the lamps in series or parallel?
The student has made a mistake in this circuit. What is the mistake?
Draw a circuit diagram to show the correct way to connect the circuit. Use the proper circuit symbols in your diagram.