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 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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GCSE    Basic Electronics    Questions 0 to 35   -->  View All

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

• For materials with extremely low resistance, see the Conductors page.
• For materials with extremely high resistance, see the Insulators page.
• For materials with middling resistance, see the Resistors pages.

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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