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MCQs: Electric circuits

Three 6V batteries are connected as shown in the diagram.

 

 

Current will flow

 

Current flows from High potential to low.

A battery converts chemical energy to electrical energy.
Electrical energy is

 

Electrical PE is the energy electrons possess due top their position.

When electrons flow along a long wire

 

According to this animation the answer is C.

A copper wire has length 2m, cross sectional area 0.2mm2 and resitivity ρ. The resistance of the wire is

 

R= ρL/A = ρ x 2/0.2 x 10-6

If 4C of charge flows from P to S in the circuit shown how much energy would be lost?

 

PD = Energy/charge so energy = PD x charge = 6 x 4

In the following circuits a battery is connected to 4 different cylinders of copper.

The circuit with the largest current is

D has the shortest length and largest so smallest resistance Area R = ρL/A hence largest current

If the resistors in the circuit below are identical which ammeter will show the Lowest reading?

A and D are equal and will measure the total current going round the circuit.
There is more resistance in the top branch of the circuit so the current through B will be less than C.

The following circuits contain batteries and resistors that are identical. The current I flowing from the batteries is labelled.

In which circuit is I the biggest?

C has the least resistance and most PD.

A charge of 10C flows through a wire in 2 seconds. The current flowing is

 

I = Q/t

A current of 16A flows for 100s. The number of electrons that pass through the wire is

 

Q= It = 1600C
Number of electrons = charge / charge of electron = 1600/1.6 x 10-19 = 1022

Total Score:

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