Static and current electricity

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  • Created by: inskipa
  • Created on: 19-06-16 17:15

Static and Current 2

Discharging is when charge is lost to the ground.

Current flows through conducters but not through insulators.

A series circuit consists of one loop.

A parallel circuits has branches.

Current is the amount of charged particles that pass a certain point in a circuit every second.

Conventional current is labelled from the +ve terminal to the -ve terminal of the cell.

Electrons are negatively charged and drift towards the positive terminal in a complete circuit.

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Static and Current

Matter consists of atoms that have a positive nucleus and negative electrons.

A neutral object has equal numbers of each type of charge.

Unbalanced charge causes static.

Static charge is usually due to friction which causes the negative charge to rub off from one onto  another, this leaves them with an equal and opposite charge.

Like charges repel.

Unlike charges attract.

When charge moves it is called elctric current.

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Static and Current 3

Ammeters have to be connected in series in a circuit (per unit of charge)

The greater the current the faster the bulb.

Voltage is the amount of energy transformed in a circuit (per unit of charge)

Voltage is measured with a voltmeter, which is conneted in parallel across part of a circuit eg a bulb.

Voltage is also referred to as Potential difference (P.d.)

Resistance of a componant is a measure of its opposition to current flow.

Resistance is measured in ohms (Ω)

A circuit with a high resistance will have a low current.

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