Electricity

Question 1

Where is electricy generated from?

Answer 1

The displacement of electrons in the atoms of materials.

Question 2

How do electrons move in conductors?

Answer 2

They are free to move.

Question 3

How to electrons move in insulators?

Answer 3

they cannot move.

Question 4

what is an electrical delivery system?

Answer 4

A system through which electrical energy is transmitted from the generators to the many points of end use.

Question 5

What are the 3 types of power station.

Answer 5

coal-fired, gas powered, nuclear.

Question 6

What are the 5 types of renewable energy?

Answer 6

Wind, Solar, tidal, hydroelectric, geothermal.

Question 7

Following voltage harmonization, what are the electricity supplies within the EU?

Answer 7

230V (+/-) 10% at 50 Hz

Question 8

In the proximity of buildings, hoe can high voltages be reduced?

Answer 8

Using transformers

Question 9

What is the most optimal location for capturing tidal energy?

Answer 9

Areas with large differences tidal range (the difference between high and low tide)

Question 10

What is the most optimal location for capturing hydroelectric energy?

Answer 10

On or near a water source particularly in hilly areas.

Question 11

What type of electrical current is normally used to supply electrical mains?

Answer 11

AC

Question 12

How are magnetic fields generated?

Answer 12

By current flow through conductors.

Question 13

What type of current is stored easily in batteries?

Answer 13

DC

Question 14

How can AC power supply be classified as?

Answer 14

Single phase and Three phase

Question 15

What is single phase power mostly used for?

Answer 15

domestics uses, tvs etc. (plug sockets)

Question 16

What is three-phase power mostly used for?

Answer 16

Non-domestic uses, industrial manufacturing factories etc.

Question 17

what is the use of a step down transformer

Answer 17

To reduce the amount of volts entering a system.

Question 18

What the use of a step up generator?

Answer 18

To increase the amount of volts entering a system.

Question 19

What is electrical energy ?

Answer 19

Energy resulting from the movement of electrically charged particles.

Question 20

Electrical energy is supplied by the combinations of?

Answer 20

electric current and electric potential.

Question 21

Where does DC power come from?

Answer 21

A linear electrical current which flows in one direction.

Question 22

What sources can DC power be stored in?

Answer 22

Batteries, solar cells,fuel cells, and some modified alternators.

Question 23

How can DC be converted to AC?

Answer 23

Using a rectifier.

Question 24

Why is DC used for many electrical devices?

Answer 24

Due to its smooth flow and constant voltage.

Question 25

What renewable energy is generated in DC form?

Answer 25

Wind and solar.

Question 26

How many wires does single phase power use?

Answer 26

Power is supplied through two wires: one delivers the current, the other provides the return path.

Question 27

What are the peaks of power delivery in a single-phase system?

Answer 27

90 and 270 (degrees)

Question 29

In three phase power, how does each phase signal being 120 degrees apart benefit?

Answer 29

There is no peak or drop offs

Question 30

What do 3 phase distribution boards do?

Answer 30

They house the circuit breakers, ground leakage protection units and fuses that are used to distribute power to individual points or circuits within a building.

Question 31

What is a core function of three phase consumer unit?

Answer 31

To allow individual circuits to draw power direct from the breakers while isolating them without disrupting the rest of the supply.