Electricity

Question 0

Define: Free Electrons

Answer 0

Electrons dissociated from their nuclei, found in metals

Question 1

Define: Static Electricity

Answer 1

The transfer of negatively charged electrons from one insulating material to another

Question 2

Define: Current

Answer 2

The rate of flow of charge

Question 3

Define: Potential Difference

Answer 3

The work done/energy transferred per coulomb of charge

Question 4

Define: Thermistor

Answer 4

As temperature increases,resistance decreases (different to most components)

Question 5

Define: Light Dependant Resistor

Answer 5

Resistance changes depending on light levels. The more light, the lower the resistance

Question 6

Define: Ohm’s Law

Answer 6

The current through a resistor (at a constant temperature) is directly proportional to the potential difference across the resistor

Question 7

Define: Resistance

Answer 7

Opposition to the flow of electric current

Question 8

Define: Series Circuit

Answer 8

All the components are joined next to each other in a line

Question 9

Define: Parallel Circuit

Answer 9

The components are joined in separate branches

Question 10

Define: Filament Bulb

Answer 10

Emits light when a current flows through it. As current increases, temperature increases and resistance increases

Question 11

Define: Diode

Answer 11

Only allows current to flow in one direction

Question 12

Define: Light Emitting Diode

Answer 12

Only allows current to flow in one direction and emits light

Question 13

Define: Variable Resistor

Answer 13

Resistance can be varied manually

Question 14

Define: Voltmeter

Answer 14

Measures the potential difference across a component. Connected in parallel.

Question 15

Define: Ammeter

Answer 15

Measures the current in a circuit or a branch of a parallel circuit. Connected in series.

Question 16

Define: Charge

Answer 16

A property of subatomic particles. Electrons have -1 charge, protons have +1 charge. Like charges repel, opposite charges attract.