P2- Electricity

Question 1

What is the symbol for a variable resistor?

Answer 1

….

Question 2

What is the symbol for a thermistor?

Answer 2

…

Question 3

How many hz in the mains supply?

Answer 3

50Hz

Question 4

What is Alternating current(ac)?

Answer 4

Alternating potential difference/current
Fluctuating

Question 5

What is the symbol for a fuse?

Answer 5

…

Question 6

What is the symbol for a diode?

Answer 6

…

Question 7

What is the symbol for a led (light emitting diode)?

Answer 7

…

Question 8

What does a diode do?

Answer 8

Only allows current to flow in one direction

Question 9

How many volts in the maison supply?

Answer 9

230/240

Question 10

What is direct current (DC) ?

Answer 10

Either positive or negative
Charge is always flowing in the same direction

Question 11

What is a fuse?

Answer 11

Contains a thin wire which melts and breaks the circuit when the current that passes it is too high

Question 12

What ways of preventing dangerous electrical surges?

Answer 12

Fuses or circuit breakers
Earth wire
Double insulation

Question 13

What is a circuit breakers?

Answer 13

Like a fuse but can be reset

Question 14

Different between fuse and circuit breaker

Answer 14

Fuse= 1 time use and cheap
Circuit breaker = can reset and more expensive

Question 15

What is double insulation?

Answer 15

A casing made of plastic which can’t conduct electricity