unit 2

Question 1

Ammeter

Answer 1

measures electric current, measured in amperes

Question 2

Battery

Answer 2

connection of two or more cells

Question 3

charge(Q)

Answer 3

electric charge passing through a point in a circuit based on a very large number (6.25x1018)

Question 4

Electrostatic Series

Answer 4

a list of materials that have been arranged according to their ability to hold on to electrons

Question 5

Insulator

Answer 5

do not allow charges to flow through them and can have static electricity

Question 6

Conductor

Answer 6

allow charges to move freely through them and cannot have static electricity

Question 7

Negative charge

Answer 7

the type of electrical charge that can be rubbed off a material

Question 8

Positive charge

Answer 8

the type of electrical charge that are left behind when negative charges are rubbed off a material

Question 9

Charging by friction

Answer 9

the process of charging materials by rubbing

Question 10

Static electricity

Answer 10

an electric charge that tends to stay on the surface of an object, rather than flowing away quickly

Question 11

Electroscope

Answer 11

a device for detecting the presence of an electric charge

Question 12

Charging by contact

Answer 12

generating a charge on a neutral object by touching it with a charged object

Question 13

Laws of electric charges

Answer 13

laws that describe how two objects interact electrically when one or both are charged

Question 14

Circuit

Answer 14

a controlled path through which electric current(or electrons) can flow

Question 15

Potential difference(V)

Answer 15

the change in energy of a unit of charge after passing through a source or load

Question 16

Load

Answer 16

anything that converts electrical energy to a form of energy that can be used

Question 17

Resistance(R)

Answer 17

the quantity that describes the hindering by a load. It will resist the flow of the current

Question 18

Series circuit

Answer 18

one path for electrons

Question 19

Parallel circuit

Answer 19

more than one path for electrons

Question 20

Current

Answer 20

charge moving past a point

Question 21

Current electricity

Answer 21

rate of movement of electric charges. Also known as the amount of charge that passes through a point in a wire every second

Question 22

Voltmeter

Answer 22

measures the amount of energy each group of electrons has when moving through a circuit

Question 23

OHM’s law

Answer 23

the ratio of potential difference to current is a constant called resistance

Question 24

Energy

Answer 24

a form of energy resulting from the flow of charged particles, such as an electron, through a conductor.

Question 25

Charging by induction

Answer 25

charging an object without actually touching the object to any other charged object

Question 26

Positive + Positive = ??

Answer 26

repel

Question 27

Negative + Neutral = ??

Answer 27

attract

Question 28

Negative + Positive = ??

Answer 28

attract

Question 29

Neutral + Neutral = ??

Answer 29

nothing

Question 30

Explain what happens when charged ebonite rod is brought near: Small pieces of paper

Answer 30

The pieces of paper will stick to the rod

Question 31

Explain what happens when charged ebonite rod is brought near: Another charged ebonite rod

Answer 31

The rods will repel from each other

Question 32

Explain what happens when charged ebonite rod is brought near: fur with an opposite charge

Answer 32

The charge on the rod will transfer to the fur

Question 33

Explain what happens when charged ebonite rod is brought near: A neutral pith ball

Answer 33

The rod with attract with the pith ball

Question 34

What is the formula of electric current? What is it measured in?

Answer 34

current = charge moving past a point/time Measured in amperes I = Q/T

Question 35

What is the formula of potential difference? What is it measured in?

Answer 35

potential energy = energy/charge measured in volts V = E/Q

Question 36

What is the formula of resistance? What is it measured in?

Answer 36

Resistance = potential difference/ current measured in ohms (Ω) R = V/I

Question 37

What is the function of a battery

Answer 37

source of current

Question 38

What is the function of a switch

Answer 38

make or break the circuit

Question 39

What is the function of an ammeter

Answer 39

measures current (amperes)

Question 40

What is the function of a voltmeter

Answer 40

measures voltages (volts)

Question 41

What is the function of a light bulb

Answer 41

converts energy into light energy

Question 42

How would you calculate energy efficiency?

Answer 42

To calculate energy efficiency, you divide the useful energy output by the total energy input, then multiple by 100 to get a percentage. For example, if a light bulb converts 20% of the electrical energy into light and the rest into heat, its energy efficiency is 20%

Question 43

How would you calculate the cost of electricity?

Answer 43

To calculate the cost of electricity, you multiply the power of the appliance in kilowatts (kw) by the time it’s used in hours (h), and then multiply by the cost per kilowatt-hour (kwh) from your electricity bill.