Current and Charge

Conductors and Insulators

A conductor is a substance which allows ammeteramperechargecurrentcurrentselectronsinsulatorjunctionnegativenotpositiveQsameseriessymbolt to flow through it.

An ammeteramperechargecurrentcurrentselectronsinsulatorjunctionnegativenotpositiveQsameseriessymbolt is a substance which does ammeteramperechargecurrentcurrentselectronsinsulatorjunctionnegativenotpositiveQsameseriessymbolt allow ammeteramperechargecurrentcurrentselectronsinsulatorjunctionnegativenotpositiveQsameseriessymbolt to flow through it.

Electric Current

An Electric Current is a flow of ammeteramperechargecurrentcurrentselectronsinsulatorjunctionnegativenotpositiveQsameseriessymbolt.

The ammeteramperechargecurrentcurrentselectronsinsulatorjunctionnegativenotpositiveQsameseriessymbolt for current is I

The unit of electric current is the ammeteramperechargecurrentcurrentselectronsinsulatorjunctionnegativenotpositiveQsameseriessymbolt or amp (A).


The size of an electric ammeteramperechargecurrentcurrentselectronsinsulatorjunctionnegativenotpositiveQsameseriessymbolt in a conductor is defined as the amount of ammeteramperechargecurrentcurrentselectronsinsulatorjunctionnegativenotpositiveQsameseriessymbolt passing a point on that conductor per second.

or

I = ammeteramperechargecurrentcurrentselectronsinsulatorjunctionnegativenotpositiveQsameseriessymbolt / ammeteramperechargecurrentcurrentselectronsinsulatorjunctionnegativenotpositiveQsameseriessymbolt

From this we can see that the ampere is equivalent to 1 coulomb per second (1A = 1 C s^-1).

Q = I X t ( Think ‘QuIt’)

Conventional Current

Conventional Current is current which is represented as going from ammeteramperechargecurrentcurrentselectronsinsulatorjunctionnegativenotpositiveQsameseriessymbolt to ammeteramperechargecurrentcurrentselectronsinsulatorjunctionnegativenotpositiveQsameseriessymbolt, whereas in reality (for a metal) it is actually the negative ammeteramperechargecurrentcurrentselectronsinsulatorjunctionnegativenotpositiveQsameseriessymbolt which are going from the negative terminal to the ammeteramperechargecurrentcurrentselectronsinsulatorjunctionnegativenotpositiveQsameseriessymbolt.

Measuring Current

• Current is measured with an ammeteramperechargecurrentcurrentselectronsinsulatorjunctionnegativenotpositiveQsameseriessymbolt.

• An ammeter must be connected in ammeteramperechargecurrentcurrentselectronsinsulatorjunctionnegativenotpositiveQsameseriessymbolt with that part of the circuit through which the current to be measured is flowing.

• The current is the ammeteramperechargecurrentcurrentselectronsinsulatorjunctionnegativenotpositiveQsameseriessymbolt at every point in a series circuit.

• The sum of the currents flowing into a ammeteramperechargecurrentcurrentselectronsinsulatorjunctionnegativenotpositiveQsameseriessymbolt is equal to the sum of the ammeteramperechargecurrentcurrentselectronsinsulatorjunctionnegativenotpositiveQsameseriessymbolt leaving the junction.

I ₁ = I ₂ + I ₃