Everything Science Grade 11

CHAPTER 19. ELECTRIC CIRCUITS 19.2

R

The resistance of the above resistor is 10 Ω and the current going through the resistor is 4A.

What is the potential difference (voltage) acrossthe resistor?

SOLUTION

Step 1 : Determine how to approach the problem

It is an Ohm’s Law problem. So we use the equation:

V = R· I

Step 2 : Solve the problem

V = R· I

= (10)(4)

= 40 V

Step 3 : Write the final answer

The voltage across the resistor is 40 V.

Exercise 19 - 1

1. Calculate the resistance of a resistor that has apotential difference of 8V across it when a
   current of 2 A flows through it.


2. What current will flow through a resistor of 6 Ω when there is a potential difference of 18 V
   across its ends?


3. What is the voltage across a 10 Ω resistor when a currentof 1,5 A flows though it?

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(1.) 01hm (2.) 01hn (3.) 01hp