## Physics - Electric Current

### Gap-Filling Quiz

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ampere      circuit      copper      coulomb      difference      direct      direction      Electromotive      electrons      number      ohmmeter      potential      recharged      second      secondary      simple      sulfuric      voltage      voltmeter      volts
In a metal conductor, current flows by the movement of . The size of the current depends on the of electrons passing a particular point in a second. The unit of electric current is the . Electricity will flow if there is a potential difference and a complete .
When current flows in one direction only, it is called current. Alternating current continuously reverses its of flow. In mains electricity, this is usually 100 times every . Current is measured with an ammeter or an connected in series. Current flows between two points if there is a potential between these points.
The difference between two points is the electrical energy converted to other forms when one passes any point in the circuit. It is measured in using a or an ohmmeter connected in parallel.
force is a voltage applied to a circuit which causes a current to flow. Sources of emf include a cell, primary and secondary cells, and the mains supply. A simple cell consists of and lead plates in dilute acid. A battery that cannot be is an example of a primary cell, while one that can be recharged such as a car battery is a cell. The mains supplies electricity to our homes at a of around 230 volts.