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Definitions are probably the most important part of Physics for the FRCA examinations. Not only do they give you something to hang your answer on, and sometimes gives you the answer to further questions, They also look amazing in a VIVA if you can give a punchy, accurate definition. That is what this page is for! All in alphabetical order!

## A – B – C – D – E – F – G – H – I – J – K – L – M – N – O – P – Q – R – S – T – U – V – W – X – Y – Z

## A

**Ampere**

‘Unit of Electrical Current; 1 ampere = 1 Coulomb/second.’

## B

**Beer’s Law**

‘The absorption of light is proportional to the concentration of the gas through which the light is travelling.’

**Boyle’s Law**

‘At a constant temperature, the volume of a fixed amount of gas is inversely proportional to its pressure.’

## C

**Capacitor**

‘Electrical device which stores electrical charge.’

**Charles’ Law**

‘At a constant pressure, Volume of a fixed amount of gas is proportional to its

absolutetemperature.’

**Conductance**

‘Conductance is the ability of the material to allow the flow of electrical charge.’

**Coulomb**

‘Unit of Electrical Charge; 1 Coulomb = 6.24×10ˆ18 electrons.’

## D

## E

## F

**Farad**

‘One Farad is the ability of a capacitor to store one coulomb of charge when a potential difference of one volt is applied across it’.

## G

**Gay Lussac’s Law**

‘At constant volume, Pressure of a fixed volume of gas will increase in proportion to

absolutetemperature.’

## H

## I

**Inductor**

‘A component which opposes the flow of current by creating an electromotive force.’

## J

## K

## L

**Lambert’s Law**

‘The absorption of light is proportional to the distance the light travels through the sample.’

## M

## N

## O

**Ohm**

‘Unit of Resistance; 1 Ohm = Resistance across two points when one volt applied across the points gives a current flow of 1 ampere.’

## P

**Perfect Gas**

‘A gas which obeys all of the three gas laws completely.’

## Q

## R

## S

**Siemen**

‘Unit of Conductance.’

## T

## U

## V

**Volt**

‘Unit of Voltage; 1 volt = 1 joule / Coulomb.’

**Voltage/Potential Difference**

‘Electrical Voltage (aka potential difference) is the energy required to move one coulomb of charge between two points in a circuit.’

## W

**Watt**

‘Unit of Power; Power (Watts) = Energy (Joules) / Time (Seconds).’

## X

## Y

## Z

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