Taking Measurements In Circuits

Th unit for current is ampere (A) or Amp.

Current is measured with an ammeter.

It’s the measure of the ability of the electrons to move from the negative terminal of a battery to the positive terminal.

Current is a measure of the number of electrons flowing along a wire. Voltage is a measure of the ability of the electrons to do a particular task.

The unit for voltage is volts (v).

Potential difference is measure using a voltmeter.

Single unit of a device that converts chemical energy into electrical energy. Different cells produce different voltages. The bigger the voltage supplied by the cell, the bigger the current (the cell gives a bigger push to the electrons).

A collection of cells that converts chemical energy into electrical energy.

The opposition to the movement of electrons is called resistance. We say that good conductors have a low resistance and not so good conductors have a higher resistance.

Easier to flow along some conducting materials than others.

Try to oppose the moving electrons.

The unit for resistance is the ohm.

Resistance is measured with an ohmmeter.

The battery, the same current returns to the battery.

Up as the current flows round the circuit.

Series circuit: Current is the same at all points in the circuit. Parallel circuit: Current is shared between the components.

Unlike an ammeter, a voltmeter is connected across components (in a parallel circuit).

Current x Resistance

Voltage divided by resistance

Voltage divided by current