3 Use P I 2 R to determine the power P dissipated when a I 9 amps and R 4 \u2126 b I

3 use p i 2 r to determine the power p dissipated

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(3) Use P = I 2 R to determine the power P dissipated when : (a) I = 9 amps and R = 4 (b) I = 14 amps and R = 5 (4) If resistors R 1 and R 2 are in parallel : 1 R R 1 R 1 R T 1 2 T = + = I then ? R T = ? (5) The formula for converting degrees Celcius to degrees Fahrenheit is : F 9C 5 32 = + Convert the following degrees C to degrees F (a) 10 (b) 100 (c) 20 (d) 0 (6) The impedance Z in a circuit is given by the formula : Z = R X 2 c 2 + where X c is the reactance and R is the resistance Find Z when (a) R = 3 and X c = 4 (b) R = 5 and X c = 12 (c) R = 8 and X c = 15 (d) R = 24 and X c = 7 Answers on page 38 R 3 R 2 R 1 Unit 1 - An Introduction to Mathematics © SECTT 2005 Page 25
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