Resistance and resistivity

Need to know

What you need to know

• 9.3 Resistance and resistivity.
• Resistance , R of a conductor is the opposition to an electrical current.
• The higher the resistance of a conductor the more work needs to be applied to push the same amount of current through a conductor (Think friction when pushing a box).
• Resistance is measured in ohms, Ω.
• Ohm’s Law states that the potential difference (V) is directly proportional to the Current (I) that flows through a conductor. 𝑅 = 𝑉 𝐼.
• This law is only obeyed provided that the temperature and other physical properties remain constant and that the conductor is ohmic.

Explanation

Resistance and resistivity

1. 9.3 Resistance and resistivity.
2. Resistance , R of a conductor is the opposition to an electrical current.
3. The higher the resistance of a conductor the more work needs to be applied to push the same amount of current through a conductor (Think friction when pushing a box).
4. Resistance is measured in ohms, Ω.