Electricity

Question 1

Ohms law

Answer 1

For a fixed temperature the voltage across a conductor is directly proportional to the current passing through it

Question 2

Transistors

Answer 2

A semiconductor device that can be used as an electronic switch

NPN more than 0.2
MOSFET more than 2V

Question 3

Electrical power

Answer 3

The electrical energy transferred per second

Question 4

Fuse

Answer 4

A safety device containing a thin wire which will break(melt) when too large a current flows through it
Other
Power ratings less than 700 W use 3A
Power ratings more than 700W use 13A

Question 5

Electrical current

Answer 5

The electrical charge transferred per second

Question 6

Direct current

Answer 6

When electrons flow in one direction only

A battery

Question 7

Alternating current

Answer 7

When the direction of electron flow continually changed back and forth

Eg mains

Question 8

Voltage

Answer 8

The energy supplied to each coulomb of charge that lasses though a power supply

Question 9

Resistance

Answer 9

The opposition to current flow

Question 10

Current definition

Answer 10

The electric charge transferred per unit time

Question 11

What is an oscilloscope trace for a.c and d.c

Answer 11

D.c= A straight line
A.c= a wave

Question 12

Voltage( potential difference)

Answer 12

Is a measure of the energy given to the charge carriers in a circuit

Question 13

What is the frequency and voltage in the mains

Answer 13

Frequency = 50hz
Voltage= 230V