7b

Question 1

Ac
Dc

Answer 1

Electricity with a periodically alternating direction of current and voltage
Electricity with a constant direction of current and voltage

Question 2

Active wire
Neutral wire

Answer 2

Wire at the end of an ac electrical system with a varying potential this wire connects to the voltage supply
Wire at the end of an ac electrical system that is fixed at 0v

Question 3

Rms (root mean square
Sinusodial

Answer 3

Measure of a time Varying (such as AC) voltage or current. A constant dc voltage or current with the same values as the rms would deliver the same average power
Having the same form of a sin value

Question 4

Defining ac and dc power

Answer 4

Ac: use for houses
Potential difference of two ends constantly change
- active wire is end that conencts to voltage supply, varies positive and negative max value, due to the way electricity is generated at the power station in homes this wire is between -240 and +240 volts
- neutral wire connected to ground 0v
- active wire at +240v conventional currents flow from active wire to neutral, for -240v it’s the opposite
Dc: potential difference of the two terminal of the batteries is fixed

Question 5

Comparing ac and dc power

Answer 5

Voltage and current to household electricity systems varies sinusodially
We use rms to describe sinusodal AC electric systems
Rms value has magnitude of constant dc value, deliver the same average amount of power

Question 6

Household electrical systems wire colour

Answer 6

Active : brown
Neutral: blue
Earth: green

Question 7

Modeling

Answer 7

Ac household electrical circuits are usually modeled as parallel dc circuits
(Always parallel due to workings)