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- Power is the rate of doing work. It is the amount of energy consumed per unit time.
- SI Unit : joule per second (J/s)

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1. Material e.g. copper has lower resistance than steel

2. Length - longer wires have greater resistance

3. Thickness - smaller diameter wires have greater resistance

4. Temperature - heating a wire increases its resistance

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- Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

- Ohmic conductors are conductors that obeys Ohm's law and a resistor at constant temperature.

- Non-ohmic conductors are conductors that doesn't obey Ohm's law and a resistor that isn't constant.

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- Resistance is the ratio of the voltage applied to the electric current which flows through it
-SI Unit : Ohms (Ω)

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V = Potential difference
W = Work done
q = Charge
△E = Change in energy

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- Potential difference across an electrical component is needed to make a current flow through it.
- SI Unit is : Volts (V)

To measure a current, you use a VOLTMETER which is connected to the circuit in parallel.

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- EMF is the energy provided by a cell or battery per coulomb of charge passing through it.
- SI Unit is : Volts (V)

# data[].attributes.body
e = electromotive force in volts, V
E = energy in joules, J
Q = charge in coulombs, C

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- Electric current is a flow of electric charge from one point to another
- SI Unit is : Ampere (A)

- CONVENTIONAL CURRENT flows from positive to negative.
- ELECTRONS flow from negative to positive.

To measure a current, you use an AMMETER which is connected to the circuit in series.