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1 Amp = 1,000 milliamps = 1000mA
0.1 Amps = 100 milliamps = 100mA
0.01 Amps = 10 milliamps = 10mA

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Cross sectional area: a= pie x diameter squared ÷ 4

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SI Units
—————
Mega
Kilo
Hecto
Deca
Unity
Deci
Centi
Milli
Micro
Nano
Pico

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Find the Rt in a parallel
1/Rt = 1/R1 + 1/R2 + 1/R3 ....

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Electron flow - to +

Conventional current flow from + to -

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Finding the rt in a series circuit
Rt = R1 + R2 + R3....

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An atom that has lost or gained 1 or more electrons is call An Ion
( Leon )

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Actual current flow is negative(-) to positive(+)

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When 1 coulomb passes a given point in one second, a current of one ampere is said to flow

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Voltage remains the same in a parallel branch

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Better Be Right Or Your Great Big Venture Goes Wrong
Black 0
Brown 1
Red 2
Orange 3
Yellow 4
Green 5
Blue 6
Violet 7
Grey 8
White 9

Gold +/- 5%
Silver +/- 10%
No bond +/- 20%

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An unbalanced atom is an atom that has gained or lost one or more electrons

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The ohmmeter measures resistance and is normally non-linear

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Electrons and protons attract

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Load is anything placed in a circuit

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In a battery
The anode is the positive plate and the cathode is the negative plate
(Graham)

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Ammeter is used to measure current (i)

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Like poles repel unlike poles attract
- to +

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The copper atom consists of 29 electrons, 29 protons and 35 neutrons

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RT is also known as equivalent resistance
(Graham)

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Common conducting materials
Silver
Copper
Gold
Aluminium
Common insulating material
PC
Rubber
Plastic
Glass
(The better graham)

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Ohm’s Law states that the current ( I ) flowing through a circuit is directly proportional to the potential difference ( U ), across that circuit, and inversely proportional to the resistance ( R ), of that circuit, provided the temperature remains constant

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Effects of electric current
Heating effect
Magnetic effect
Chemical effect

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Q= i x t

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An increase in resistance will cause a decrease in current provided the voltage stays the same

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U=i x r

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Voltage is directly proportional to current provided resistance remains constant