Physics - Electricity

What is electric current? State it’s units

the rate of flow of charge. it is measured in amps(amperes)

What is potential difference?

The work done moving a unit charge between 2 points in a circuit V = W / Q

What is resistance?

How difficult it is for current to flow through an appliance. A component has a resistance of 1Ω if 1A flows through it when a p.d of 1V is applied across it. R = V / I

What is meant by an ohmic conductor?

A conductor that obeys Ohm’s law, meaning that current is directly proportional to potential difference providing physical conditions (such as temperature) remain constant.

How can you measure the current in a circuit?

You can measure the current in a circuit with an ammeter connected in series with the component.

How do you measure potential difference across a component?

Using a voltmeter, connected in parallel across the component being measured.

What does the gradient of a current-potential difference graph represent?

Rate of change of current with respect to voltage. This is not the same as 1/R

Does this graph represent an ohmic conductor?