Topic 4.3 - Electric Circuits

Question 1

Draw the circuit symbol for a switch

Answer 1

Question 2

Draw the circuit symbol for a cell

Answer 2

Question 3

Draw the circuit symbol for a battery

Answer 3

Question 4

Draw the circuit symbol for a lamp

Answer 4

Question 5

Draw the circuit symbol for a fuse

Answer 5

Question 6

Draw the circuit symbol for a voltmeter

Answer 6

Question 7

Draw the circuit symbol for an ammeter

Answer 7

Question 8

Draw the circuit symbol for a diode

Answer 8

Question 9

Draw the circuit symbol for a resistor

Answer 9

Question 10

Draw the circuit symbol for a thermistor

Answer 10

Question 11

Draw the circuit symbol for a variable resistor

Answer 11

Question 12

Describe the current across a series circuit

Answer 12

The current is the same across all points in a series circuit.

Question 13

Describe potential difference in a series circuit

Answer 13

Potential difference is split between components, according to the ratio of their resistances.

Question 14

Describe current across a parallel circuit

Answer 14

The current is divided between the branches of the circuit.

Question 15

Describe the potential difference across a parallel circuit

Answer 15

Each branch has a potential difference equal to the potential difference of the supply

Question 16

What is total resistance in a series circuit?

Answer 16

The sum of the resistances from each component.

Question 17

Why is it advantageous to connect lamps in parallel?

Answer 17

If one lamp blows, the rest will be unaffected and can still receive current (i.e. the circuit is still complete).

Question 18

How do multiple power sources affect emf?

Answer 18

In series, the emfs of individual sources are added to give the total emf.

Emfs in parallel do not add.

Question 19

What is a thermistor?

Answer 19

A resistor in which resistance decreases as temperature increases.

Question 20

What is an LDR

Answer 20

A resistor in which resistance decreases as light intensity increases.

Question 21

What is a diode?

Answer 21

A component which only allows current to flow in one direction