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one ohm is one volt per lamp

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charge (C) = current (A) x time (s)

Q = It

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current (A) = charge(C)/time(s)

I = Q/t

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- an analogue meter has a needle, which moves across a scale
- a digital meter gives a direct read-out in figures

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a voltmeter is a device used for measuring electrical potential difference between two points in an electrical circuit

it is always connected in parallel across a component

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The electrical resistance of an electrical conductor is a measure of the difficulty to pass an electric current through that conductor. The inverse quantity is electrical conductance, and is the ease with which an electric current passes.

Unit of a resistance is measured in ohms.

R = V/I

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Similarities of emf and potential difference

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Similarities of emf and potential difference

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Similarities:

Have same unit (Volt)

Can be measured by Voltmeter

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Definition
The potential difference (p.d.) between two points is defined as the energy converted from electrical to other forms when one coulomb of positive charge passes between the two points.

Symbol
Denote by the symbol, V

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Definition
The electromotive force (e.m.f.) is defined as the energy per unit charge that is converted from chemical, mechanical, or other forms of energy into electrical energy in a battery or dynamo.

Symbol
Denote by the symbol, E.

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V = IR

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current - rate of flow of charge
voltage - work done by the electron
emf - work done by the cell on electron to complete the circuit

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ammeter is a device that measures the electric current flowing in a circuit

it is always connected in a series

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good : most metals, including copper, silver, gold, steel

bad : polymers (such as perspex or polythene), minerals, glass, rubber

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electrons flow from negative to positive direction

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conventional current flows from positive to negative direction

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Terminal Voltage of Batteries Explained | Doc Physics

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Terminal Voltage of Batteries Worked Example | Doc Physics

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Uploaded by Sukesh Kamath on 2015-06-25.

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Uploaded by Sukesh Kamath on 2015-05-27.

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electric current is the flow of electron along the connecting wires in a circuit.

The electrons flow from negative to positive of the power supply.

Conventional current direction is opposite to the flow of electrons- current direction is from positive to negative.

Si unit of current is Ampere (A)