P7: Quiz 8 – Answers

2)

a) Potential difference in parallel circuits is the same across all components/ all of the components receive the source potential difference

b) Current is shared between branches (the current that enters a junction is the same as the current that leaves a junction)

3)

a)

i) 12 V

ii) 12 V

b)

i) 1.5 A

ii) 2 A

iii) 3.5 A

c) 3.4 Ω

4)

a)

i) 0.8 A

ii) 0.5 A

iii) 1.3 A

5)

a) 0.5 A

b) 0.25 A

c) 16 Ω

6)

a) 1.5 A

b) 4 Ω

1) Draw a circuit with a battery and 2 filament bulbs connected in parallel.

2) What are the rules for the following in a parallel circuit?

a) Potential difference

b) Current

3) The circuit below contains a cell and 2 resistors that are connected in parallel.

a)

i) What will be the value for potential difference on voltmeter V_{1}?

ii) What will be the value for potential difference on voltmeter V_{2}?

b)

i) What will be the value for current on ammeter A_{1}?

ii) What will be the value for current on ammeter A_{2}?

iii) What will be the value for current on ammeter A_{3}?

c) Use your value for the current on A_{3} to calculate the total resistance of the circuit. Give your answer to 1 decimal place.

4) The circuit below contains a battery and 2 resistors that are connected in parallel.

a) Calculate the values for the current on the following ammeters.

i) A_{1}

ii) A_{2}

iii) A_{3}

5) The circuit below shows 2 resistors connected in parallel. One of the resistors has a resistance of 8 Ω and the other resistor has an unknown resistance.

The value for current on ammeter A_{3} is 0.75 A.

a) What will be the value for current on ammeter A_{1}?

b) What will be the value for current on ammeter A_{2}?

c) What is the resistance of the unknown resistor?

6) The circuit below contains a cell and 2 identical filament bulbs.

The value for current on ammeter A_{1} is 3 A.

a) Calculate the current passing through each of the identical filament bulbs.

b) Calculate the resistance of each of the identical filament bulbs.