Electricity – Leaving Cert Physics Terms

Leaving CertificatePhysics

Coulomb’s Law – states that the force between two point charges is proportional to the product of the charges and inversely proportional to the square of the distance between them.

Electric Field Strength (E) – is the force per unit charge.

Potential Difference (p.d.) – between two point is the work done in bringing a charge of one Coulomb from one point to the other.

Volt – The potential difference between two points is one volt if one Joule of work is done when bringing a charge of one Coulomb from one point to another.

The potential at a point – refers to the work done in bringing unit charge from that point to earth.

Capacitance – of a conductor is the ratio of the charge on a conductor to its potential.

Current – is a flow of charge.

1 Amp = – 1 C / s

EMF – voltage when applied to a complete circuit.

Resistance – of a conductor is the ratio of the Potential Difference across it to the current flowing through it.

Ohm’s Law – the current flowing through a conductor is directly proportional to the Potential Difference across it, assuming constant temperature.

Resistivity – (Resistance X Area) / length

Joules Law – states that the rate at which heat is produced in a conductor is proportional to the square of the current, provided its resistant is constant

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