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Current and Charge: Questions

Current is the flow of electrons measured in amperes. Charge is measured in coulombs. In a series circuit, the current is the same at all points. In a parallel circuit, the current splits at junctions. Conventional current flows from the positive terminal of a cell to the negative terminal, while electron flow is opposite. A circuit contains a cell connected to a filament lamp and ammeter. The current can be turned on and off with a switch and measured with an ammeter. In a parallel circuit, the current is not the same at all points but ammeters in parallel paths will show the same current. If the same charge flows through one ammeter in 1 minute, the same charge will flow through parallel

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Dominic Wynes-Devlin
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204 views4 pages

Current and Charge: Questions

Current is the flow of electrons measured in amperes. Charge is measured in coulombs. In a series circuit, the current is the same at all points. In a parallel circuit, the current splits at junctions. Conventional current flows from the positive terminal of a cell to the negative terminal, while electron flow is opposite. A circuit contains a cell connected to a filament lamp and ammeter. The current can be turned on and off with a switch and measured with an ammeter. In a parallel circuit, the current is not the same at all points but ammeters in parallel paths will show the same current. If the same charge flows through one ammeter in 1 minute, the same charge will flow through parallel

Uploaded by

Dominic Wynes-Devlin
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Current and charge

Questions
1 Fill in the gaps below. Use the words provided in the box.

split electrons charge the same ampere coulomb

Current is the flow of and is measured in

. The charged particles that flow in metals are

. Charge is measured in . The current or

charge at any point in a series circuit is always . The current

or charge will at a junction in a parallel circuit. (6 marks)

2 a Look at the series circuit below and fill in the gaps that follow based on the information provided.

Conventional current flows from to

. Electron flow is from the

terminal of the cell to the terminal of the cell.

The circuit contains a filament , connected with

to a .

The size of the current is at each point in the circuit.

The current can be measured by inserting an into the

circuit. The current, or flow of , could be turned on and

off by using a .(11 marks)


b Look at the parallel circuit below and fill in the gaps that follow based on the information
provided.

The parallel circuit contains one , two

and four .

The size of the current flowing in the circuit is not at

every point. The current shown by ammeter A1 will have the same value as

ammeter . The current flowing through A2 will have the

same value as the current flowing through ammeter .

If the current flowing through the bulbs is the same, then they will both appear

to have the same provided that they are identical. If

120 C of charge flows through ammeter A1 in 1 minute, then the amount of

charge flowing through A2 in this time will be .

This means that the current value shown on ammeter A1 will be

and the current reading shown on ammeter A3 will be

. (10 marks)
3 The diagram below shows a series circuit containing a 6 V cell, an ammeter,
a filament lamp, and a variable resistor.

Which of the following statements are true?


a The size of the current is 300 mA at all points in the circuit.
True / False
because

(2 marks)

b The charge that flows through the bulb is twice as big as the charge that flows
through the cell.
True / False
because

(2 marks)

c The charge gets used up by the variable resistor and converted to heat.
True / False
because

(2 marks)

d The charge that flows through the cell in 1 minute is equal to 18 C.


True / False
because

(2 marks)
4 Calculate how much charge passes through the LED in 1 hour if the current
flowing in the circuit below is 350 mA.

(4 marks)

5 All three of the bulbs in the circuit below are identical. The cell has a potential
difference of 12 V, and a total of 540 C of charge passes through the cell every 3
minutes.

a Calculate the current flowing in each of the bulbs A, B and C.

(4 marks)

b Suggest what would happen to the size of the current that would leave the
cell if the switch was opened.

(2 marks)

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