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**Force** — An expression of the ability to push, pull, twist or accelerate a body.
**Mechanical Advantage** — The ratio of the force produced by a machine to the applied input force.
**Work** — A measure of energy expended in moving an object. Force times distance equals work (F*D = W).

**Motion** — The body said is in motion if its position changes with respect to time.
**Rest** — A body said to be in rest if its position does not changes with respect to time.
**Distance** — It is the length of the actual path traversed by the body between its initial and the final positions.
**Displacement** — It is defined as the change in the position of the object in a fixed direction.

### Electricity[edit]

**Electricity** — Electricity is the flow of electrons in a conductor.
**Ohm** — The SI unit measuring the electrical resistance.
**Mega-ohm** — A unit of electrical resistance which is equal to one million ohms.
**Ampere** — The basic SI unit measuring the quantity of electricity.
**Ohmmeter** — Ohmmeter is an instrument for measuring resistance in a conductor. The unit used is in ohms.
**Mega-ohmmeter** — An instrument for measuring extremely high resistance. The unit used is mega-ohm.
**Ammeter** — An electric meter used to measure current. The unit used is in amperes.
**Voltmeter**— A voltmeter is an instrument used for measuring the potential difference (voltage) between two points in an or electronic circuit.
**Voltage Drop** — The loss of voltage between the input to a device and the output from a device due to the resistance of the device.
**Potential Difference** — The difference in electrical potential (voltage) from one point in an electric circuit to another point.
**Direct Current (DC)** — The current flowing in one direction only.
**Alternating Current (AC)** — The current flow which first goes one way and then reverses it's direction at regular time interval.
**Battery** — These are devices which convert chemical energy into electric energy.