Chapter 3 - Electricity

Question 1

a path for electrons to follow, consisting of a power supply, one or more loads, and conductors joining the power supply and loads.

Answer 1

Electrical circuit

Question 2

device used to measure the voltage across a component in a circuit. Voltmeters are placed in parallel with the components.

Answer 2

Voltmeter

Question 3

device used to measure the amount of current in a circuit. Ammeters are placed in series with other components in a circuit.

Answer 3

Ammeter

Question 4

a path for electrons to follow, consisting of a power supply, one or more loads, and conductors joining the power supply and loads.

Answer 4

Electric circuit

Question 5

physical property of matter that causes it to experience a force when near other electrically charged matter. Electric charge can be positive or negative.

Answer 5

Electric charge

Question 6

central part of an atom, made up of protons and neutrons; roundish structure inside a cell that acts as the control centre for the cell. Plural = nuclei.

Answer 6

Nucleus

Question 7

negatively charged, very light particles in an atom. Electrons move around the nucleus of the atom.

Answer 7

Electrons

Question 8

the charge on an atom or object with more electrons than protons.

Answer 8

Negative electric charge

Question 9

positively charged particles found in the nucleus of an atom.

Answer 9

Protons

Question 10

the charge on an atom or object with fewer electrons than protons.

Answer 10

Positive electric charge

Question 11

particles with no electrical charge that are found in the nucleus of an atom.

Answer 11

Neutrons

Question 12

having more protons than electrons (more positive charges than negative charges).

Answer 12

Positively charged

Question 13

having more electrons than protons (more negative charges than positive charges).

Answer 13

Negatively charged

Question 14

having the same number of protons and electrons.

Answer 14

Neutral

Question 15

a build-up of charge in one place.

Answer 15

Static electricity

Question 16

a device that can provide an electric current.

Answer 16

Power supply

Question 17

that uses electrical energy and converts it into other forms of energy.

Answer 17

Load

Question 18

connected series of materials along which an electric current can flow.

Answer 18

Conducting path

Question 19

a measure of the number of electrons flowing through a circuit every second. An increase in current means an increase in the rate of flow of electrons in the circuit.

Answer 19

Electric current

Question 20

coil of wire made from a metal that glows brightly when it gets hot. The filaments in light globes heat up when electricity flows through them.

Answer 20

Filament

Question 21

device that opens and closes the conducting path through which a current flows.

Answer 21

Switch

Question 22

measure of the electrical energy required for an electric current to pass through an object. The energy is changed to heat.

Answer 22

Resistance

Question 23

diagram using symbols to show the parts of an electric circuit.

Answer 23

Circuit diagram

Question 24

a circuit with the components joined one after the other in a single continuous loop.

Answer 24

Series circuit

Question 25

a circuit that has more than one path for electricity to flow through. If one of the paths has a break in it, the others will still work.

Answer 25

Parallel circuit

Question 26

error caused by reading a scale at an angle rather than placing it directly in front of the eye.

Answer 26

Parallax error

Question 27

an error that occurs due to estimation when reading scales, or when the quantity being measured changes randomly.

Answer 27

Random errors

Question 28

errors that are consistently high or low due to the incorrect use or limitations of equipment.

Answer 28

Systematic errors

Question 29

Is the slowing down and reduction of the electrons flowing through a circuit.

Answer 29

Resistance

Question 30

a measure of how difficult it is for the electron to travel/or flow.

Answer 30

Electrical Resistance