1. Electrical circuits

Question 1

Series Circuit

Answer 1

Series Circuit

• has no branches
• current can only flow in one path

Question 2

What is an electrical current?

Answer 2

An electrical current is:

• a flow of electrons round a circuit
• the unit of electrical current is called Amp

Question 3

What is an Ammeter used for?

Answer 3

An Ammeter is used for:

• the current in a circuit

Question 4

What is the current is a series circuit?

Answer 4

• in a series circuit the current is always THE SAME

Question 5

Parallel Circuits

Answer 5

Parallel Circuits

• contain branches so the current splits
• the current in the BRANCHES adds up to the TOTAL CURRENT LEAVING THE CELL

Question 6

Potential energy (Voltage)

Answer 6

Potential Energy

• the cell has a store of CHEMICAL energy
• the chemical energy is transferred to ELECTRICAL energy by the electrons passing out of the cell
• the energy type changes depending on what sort of COMPONENT you have eg if it is LAMP the energy transfer will be LIGHT energy & THERMAL energy

Question 7

Potential Difference (V) is measure by a:

Answer 7

Potential Difference is measured by:

• a VOLT METER
• eg if have 1 lamp 9V - pd of lamp 9V
• eg if have 2 lamps the pd will be 4.5 and the lamps will be dimmer
• eg is have 2 lamps one 3.5 and another 5.5 the second one will be brighter

Question 8

What is equivalent Resistance?

Answer 8

Equivalent Resistance

• when two resistors and replaced by 1 eg 100 ohm and 50 ohm is replaced by 150ohm resistor