electricity

How does terminal velocity work

Object has weight

It accelerates as it falls

Object has drag which increases as it accelerates

Eventually drag = weight and there is a constant velocity

In a cell / battery, which line is the positive terminal?

Bigger line

Benefits of using a circuit breaker over fuse

Faster and can be reset

What normally happens when you increase the temperature of something

Resistance increases

What happens when you increase the temperature of a thermistor (hockey stick) or a light dependant resistor

Resistance decreases

In a series circuit, what is same everywhere, and what is shared

Current same everywhere, voltage shared

In a parallel circuit, what is the same everywhere and what is shared

Voltage same everywhere, current shared

What colour is the live wire

Brown

What colour is the neutral wire

Blue

What colour is the earth wire (provides an alternative pathway with low resistance)

Green and yellow

What is the unit for time always in

Seconds

Where does d.c come from?

Battery

What is a d.c current

Steady current in one direction from positive to negative

Where does a.c. Current come from

Generator

What is a.c. Current

Current that changes direction, two identical terminals that switch between positive and negative