GCSE Basics Atom BCD Binary Conductors Current Energy Equations Insulators Maths Power >Resistance< Safety SI Units Superconductors Symbols Transfer Characteristics Voltage |
Basics Resistance |
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Resistance opposes the free flow of electrons. It is measured in Ohms. The symbol is Ω.
Resistance is the number of volts needed to make one amp flow through the resistor. R = V / I
If you know the current (I) through a resistor and the voltage (V) across a resistor, you can calculate the resistance ...
R = V / I
I = V / R
V = I R
With any two known values, the third can be calculated.
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