Electricity

Question 1

Ammeter

Answer 1

A meter that measure the flow of electrical current in amperes

Question 2

Battery/ Cell/ power pack

Answer 2

coulomb ‘water pump’ contains chemical energy, gives coulombs electrical energy

Question 3

globe

Answer 3

compnent that turns electrical energy into kinetic energy

Question 4

switch (open)

Answer 4

results in a loss of electric energy that can isolate certain parts of the circuit

Question 5

switch (close)

Answer 5

allows electric current to flow easily

Question 6

resistor

Answer 6

to reduce the overall current supply to object in the circuit

Question 7

variable resistor

Answer 7

to reduce that current supply to objects in the circuit with controls such as a dimmer

Question 8

Voltmeter

Answer 8

An instrument used for mesuring electric potential in volts

Question 9

wire

Answer 9

a conducting material that allows an electric flow

Question 10

conventional current

Answer 10

is the flow of electric charge from positive to negative

Question 11

series circuit

Answer 11

a circuit that allows the current to flow in only one path. There is only one pathway for the current in the circuit.

Question 12

Parallel circuit

Answer 12

a circuit in which the current divides in to two or more paths before recombining to complete the circuit. Each segment of the circuit receives half the full energy (the energy at the start and beginning of the circuit).

Question 13

voltage

Answer 13

the measure of energy given to the charge flowing in a circuit. The greater the voltage, the greater the force or ‘pressure’ that drives the charge the circuit. This is measured by a voltameter. This is placed on the outside of the circuit.

Question 14

resistance

Answer 14

the opposition to the flow of an electric current, producing heat. The greater the resistance, the less current gets through. As electrons move through a resistor they cause friction. This friction creates heat, and the material gets warmer and sometimes lights up. Good conductors have low resistance. Resistance is measured by a resistor (Ohms), the resistor is placed in the circuit.

Question 15

What happens to the electrical energy that is wasted in a resistor?

Answer 15

The wasted energy of the resistor converts into heat due to friction.

Question 16

When is a resistor useful in a circuit?

Answer 16

When the energy running through the circuit needs to be controlled or decreased.

Question 17

Electric current:

Answer 17

is the flow of electrons from one atom to the next, through a conductor (metal material). This is measured by an ammeter in amperes, placed in the circuit.

Question 18

Short circuit:

Answer 18

A malfunction ina circuit where the current can escape

Question 19

coulomb

Answer 19

6.25 billion billion protons or electrons

Question 20

conductor

Answer 20

is something which allows electricity to flow through it quickly. Good conductor of electric current has a low resistance. e.g. silver, copper, paper clip

Question 21

Insulator:

Answer 21

do not allow any current to pass through them. These protect us from harm that electric current can possess. Wires are always covered with an insulator. An insulator has a high resistance.E.g. plastic, cotton, rubber, glass

Question 22

Ohms Law

Answer 22

V=IR

Question 23

To work out power

Answer 23

P = VI