Circuits

Question 1

Wire

Answer 1

Conducts electricity

Question 2

Cell

Answer 2

Source of electricity
Battery = connection of cells
Leaves through the negative end
Returns through the positive end

Question 3

Bulb

Answer 3

Load - uses electricity

Question 4

Fan

Answer 4

Load - uses electricity

Question 5

Motor

Answer 5

Load - uses electricity

Question 6

Switch

Answer 6

Turns circuits on/off (a closed circuit allows electrons to flow when switch is turned on)

Question 7

Fuse

Answer 7

Protection device - metal strip melts when too much current, stopping circuit

Question 8

Resistor

Answer 8

Resists the flow of electricity

Question 9

Ammeter

Answer 9

Measures electric current

Question 10

Voltmeter

Answer 10

Measures electrical potential (voltage drop) (difference)

Question 11

What is current electricity

Answer 11

• Electricity in motion
• Electrons flowing from one place to another
• More useful than static electricity
• Measured using an ammeter

Question 12

What is it called if there is a break in the circuit? What happens?

Answer 12

Open circuit. It will not allow electrons to flow

Question 13

What does a complete circuit need?

Answer 13

• Power supply
• Load(a device that uses power)
  Eg. lamps, toasters, radios
• Connected in a circle

Question 14

Controlled circuit

Answer 14

Has a switch to open and close a circuit

Question 15

Fused circuit

Answer 15

Has a fuse which is a safety advice that stops if too much electricity is flowing

Question 16

Short circuit

Answer 16

Has a path that lets electrons flow but has no load. It’s very dangerous

Question 17

Flow of electrons is called a _

Answer 17

current

Question 18

4 parts of a circuit

Answer 18

1. Energy source
2. Wires
3. Load
4. Switch

Question 19

What does the energy source do?

Answer 19

Provides the push that makes the current move around a circuit

Question 20

What do wires do?

Answer 20

Connects the energy source and load

Question 21

What does a load do?

Answer 21

Converts electrical energy to another form

Question 22

What does a switch do?

Answer 22

Opens and closes the circuit

Question 23

How to calculate voltage?

Answer 23

V = R x I

Question 24

I

Answer 24

Current

Question 25

V

Answer 25

Voltage

Question 26

R

Answer 26

Resistance

Question 27

Voltage in a series circuit

Answer 27

The voltage adds up to the VT

Question 28

Voltage in a parallel circuit

Answer 28

The voltage in each path adds up to the VT in a parallel(not sharing) circuit

Question 29

Current in a series circuit

Answer 29

The current is always the same everywhere

Question 30

Current in a parallel circuit

Answer 30

The current adds up to the total because it has many paths

Question 31

Combination Circuit

Answer 31

- More than 1 path - More than 1 load on the path

Question 32

4 Factors That Affect Resistance(R)

Answer 32

1. Material 2. Diameter of wire/material 3. Length of wire/material 4. Temperature of material

Question 33

Material

Answer 33

if metal, then less R. If non-metal, then more R

Question 34

Diameter of material/wire

Answer 34

the greater the diameter, the lower the resistance(or faster flow)

Question 35

Length of material/wire

Answer 35

longer wire = more resistance + higher temperature

Question 36

Temperature of Material

Answer 36

as temperature increases, more R

Question 37

Where is a voltmeter drawn?

Answer 37

Drawn around a load/resistor

Question 38

Where is an ammeter drawn?

Answer 38

Drawn anywhere on a circuit

Question 39

What is current measured in?

Answer 39

Amperes

Question 40

How to calculate RT in a series? Both ways

Answer 40

RT = R1 + R2 + R3 VT/IT = RT

Question 41

How to calculate RT in a parallel circuit

Answer 41

1/RT = 1/R1 + 1/R2 + 1/R3