Lv2 Electricity & Mag

Ammeter

Device that measures how much electric charge passes a point each second. ( charge flow )

Amps

Unit of current; equal to the flow of 1 coulomb of charge per second = 6.24 × 10¹⁸ electrons drift past each second.

Combination circuit

A circuit that contains both series and parallel sections within the same network.

Coulomb

The unit of electric charge; the amount of charge carried by approximately  6.24 × 10¹⁸ electrons.

Current (I)

The rate of flow(speed) of electric charge passed through a point per second; measured in amperes.

Diode

A semiconductor component that allows current to flow in one direction only, blocking reverse current.

Lamp brightness

A measure of how much power a bulb converts into light; higher power output means a brighter lamp.

Non-ohmic conductor

A component whose resistance changes with temperature, light level, or other conditions; does not obey Ohm’s law.

Ohm’s law

The relationship , stating that voltage is directly proportional to current for a component with constant resistance.

Ohmic conductor

A material or component with constant resistance, meaning current and voltage are proportional.

Ohms

The unit of electrical resistance; one ohm is the resistance that allows 1 amp of current to flow with 1 volt applied.

Power

The rate at which energy is transferred or converted; 

Resistance

A property of a material that opposes the flow of electric current, converting electrical energy into heat; measured in ohms.

Voltage

Work done per coloumb of charge that passes through a given point. Tells you how much energy each coulomb gets or loses. The energy transferred per coulomb of charge.

Volts

The unit of voltage; equal to joules per coulomb.

Watts

The unit of power; equal to joules per second.

Conventional current

The movement of charges from a positive terminal to a negative terminal.

Relationship between electrons, coulombs and amps

•  Electrons are the tiny particles moving.

•  Coulombs are how we measure the total charge they carry.

•  Amps are how fast that charge flows per second.

So:

Electrons → carry charge → measured in coulombs → flowing per second → measured in amps