Everything Science Grade 10

CHAPTER 17. ELECTRIC CIRCUITS 17.5

Step 3:Calculate the total resistance for the next pair of resistors

Then we use the formula for two parallel resistors again to get the total

resistance for this new circuit:

RP=RR^1 R^2

1 +R 2

=(4 4 ,,77 Ω + 3 Ω77 Ω)(3 Ω)

=^14 ,31 Ω

2

11 ,77 Ω

= 1,84 Ω

Step 4:Quote the final result

The total resistance of the resistors in parallel is 1 ,84 Ω. This is the

same result as when we added all three resistors together at once.

Exercise 17 - 1

1. What is the unit of resistance called and what is its symbol?

2. Explain what happens to the total resistance of a circuit when resistors are

added in series?

3. Explain what happens to the total resistance of a circuit when resistors are

added in parallel?

4. Why do batteries go flat?

More practice video solutions or help at http://www.everythingscience.co.za

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Physics: Electricity and Magnetism 309