CURRENT ELECTRICITY (FORM II)
1. An operating
lamp draws a current of 0 .4 amperes. The amount of charge passing through the
lamp in 10 seconds is?
2.
If a potential difference
of 6.0 V is measured across the end of a wire of resistance 12Ω,
i)
What current flows through
it?
ii) What potential difference is required to make a current of 1.5 A
flow through it?
3.
(a) Two resistors of 6Ω
and 12Ω
are connected in parallel. Calculate their total resistance.
(b) Two resistors 3Ω
and 6Ω
are connected in parallel.
i)
Draw the schematic diagram
ii) What is the total resistance of circuit?
iii) Calculate the potential difference of the circuit when current
across that is 5 A
4.
The 2Ω and 4Ω resistors are
connected in a circuit. What is the resistance of the circuit when;
i)
Resistors are connected in parallel
ii) Resistors are connected in series
5.
(a) The current in an
electric circuit is 0.25 A. How long does it take for the quantity of charge
5000 C to pass any given point in the circuit?
(b) An electric kettle has
resistance of 32Ω. If the potential difference across is 240 V, find the current
flowing through the kettle.
6.
Two cells each with e.m.f
1.5 V and internal resistance of 2 W are connected in
i)
series
ii) Parallel.
Find the current in each case
when the cells are connected to 1 W
resistor.
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