Circuits And Currents

Question 1

Current

Answer 1

• the flow of electrical charge (electrons) around a complete circuit per second
• current flows in opposite direction of the electrons

Question 2

Ammeter

Answer 2

• a device for measuring of an electric current in a circuit

Question 3

Amps

Answer 3

• unit of measurement of an electric current

- symbol A

Question 4

Battery

Answer 4

-two or more electrical cells joined

Question 5

Cell

Answer 5

Power supply which pushes the charge around the circuit

Question 6

Motor

Answer 6

Component/machine that spins when a current flows through

Question 7

Switch

Answer 7

Component that controls the current by making or breaking the circuit

Question 8

Wires

Answer 8

Carry the current between components

Question 9

Measurements of charge and current

Answer 9

• coulombs measure electric charge
• amps measure current
• 1A = 1 coulomb

Question 10

Electric circuit must have:

Answer 10

• source of energy
• a component
• component loop
• no short circuits

Question 11

Short circuit

Answer 11

• The part of the circuit with no component
• current will always take the route with the least resistance (the short circuit)
• it has a choice of where it will go

Question 12

Series circuit

Answer 12

• Components followed by each other on the same loop

- if one bulb or component breaks the circuit will fail

Question 13

Parallel circuit

Answer 13

• Has More than one loop

- allows you to control the bulbs separately

Question 14

Current in a series circuit

Answer 14

• would measure all the same

- adding another component would make the current decrease

Question 15

Current in a parallel circuit

Answer 15

• current will vary due to branches
• it splits between the loops so it will have different measurements
• total current =sum of all current measured in all branches