Chapter 2- Electricity

Question 1

What is electricity?

Answer 1

The flow of electric charge (electrons)

Question 2

How is electric current produced?

Answer 2

Free electrons create electricity which creates a chan effect that creates a flow of electrons.

Question 3

What acts as a charge carrier and what allows us to move charges?

Answer 3

Electrons can act as charge carriers and free electrons all us to move charges

Question 4

What are the components of a circuit and give an example.

Answer 4

1. Source (battery)
2. Load (light bulb)
3. Control (switch)
4. Conductor (connecting wires)

Question 5

What is a circuit?

Answer 5

Components of electrical devices and wires to create a path for electricity to flow from one point to another.

Question 6

What is an electric cell?

Answer 6

A component which uses chemical reactions to produce electricity

Question 7

What is a battery?

Answer 7

Two or more cells which uses external connections to produce electricity

Question 8

What is the difference between a wet and dry cell?

Answer 8

A wet cell consists of electrolyte (common household material) whereas a dry cell is when electrolyte is restrained (cell phones and computers)

Question 9

Who are the inventors of the light bulb?

Answer 9

Humphrey Davy (incandescent light bulb)
Thomas Edison
Joseph Swan

Question 10

What does LED stand for?

Answer 10

Light-emitting diode

Question 11

What is an LED?

Answer 11

Two lead semi-conductor light source

Question 12

What does a resistor do and what is the unit for resistance?

Answer 12

Reduces current flow and reduces voltage (ohms)

Question 13

What is a rheostat?

Answer 13

Electrical switch that adjusts current.

Question 14

What is a potentiometer?

Answer 14

An adjustable voltage divider. Can act as a resistor and rheostat.

Question 15

What is the relationship between resistance and current?

Answer 15

Higher resistance, lower current

Lower resistance, more current

Question 16

What factors determine the resistance of a metal?

Answer 16

1. Length
2. Material
3. Temperate
4. Area if cross section

Question 17

What is a series circuit?

Answer 17

A circuit with only one path for electricity.

Question 18

What is a parallel circuit?

Answer 18

A circuit with more than 1 resistor (bulb) and it has more than one path for electricity.

Question 19

What is a conductor?

Answer 19

Material that allow current to flow easily

Question 20

What is an insulator?

Answer 20

Material that restrict transfer or heat or electricity

Question 21

What is voltage?

Answer 21

The pressure from electrical circuits power source that pushes through a conducting loop. Measured by a voltmeter in parallel. Unit: Volts (V)

Question 22

What is current measured in and with what device?

Answer 22

In Amps (A) with an ammeter in series

Question 23

What is the formula for resistance in parallel?

Answer 23

Rt= 1/R1+1/R2=1/R3

Then get the reciprocal of that answer

Question 24

What is the formula for resistance in series?

Answer 24

Rt=R1+R2+R3

Question 25

What is the right hand rule?

Answer 25

Curl your hands into a half circle around the wire, they point in the direction of magnetic field and your thumb points in the direction of conventional current.