Resistance And Resitivity - Chapter 10

Question 0

Formula for resistance

Answer 0

Resistance = voltage/current

R=V/I

Question 1

What determines the size of the current?

Answer 1

• the potential difference or voltage across the lamp - the greater the voltage, the greater the current for a given lamp.
• the resistance of the lamp - the greater the resistance, the smaller the current for a given voltage.

Question 2

What is one ohm equivalent to?

Answer 2

One ohm equals one volt per ampere

Question 3

What is the ohm?

Answer 3

The ohm is the resistance of a component when a potential difference if 1volt is produced per ampere of current.

Question 4

How do you determine the resistance from a graph? What formula do you use?

Answer 4

Resistance = 1/ gradient of graph

Question 5

State ohms law

Answer 5

For a metallic conductor at constant temperature, the current in the conductor is directly proportional to the potential difference across its ends