For questions 1- 3, please refer to the circuit below s00 45 90 1. What is the t

Question

For questions 1- 3, please refer to the circuit below s00 45 90 1. What is the total resistance of the circuit? 2. What is the total current leaving the battery? 3. What is the current through the 45 ohm resistor? 4. A 1200 Watt hair dryer is plugged into a 120 volt circuit. What is the current drawn by the hair dryer? For questions 5 -8, please refer to the circuit below. 1 25 150 75 175 5. What is the total resistance of the circuit? 6. What is the total current leaving the battery? 7. What is the voltage lost at the 75 ohm resistor? 8. What is the current through the 175 ohm resistor? 9. An 95 Watt TV is plugged into a 115 volt circuit. The TV operates for 120 minutes. If the cost of energy is 8e per kW-hr, how much does it cost to run the TV for 120 minutes

Explanation / Answer

for the given question

a. total resistance = Reff = 50 + (45*90)/(45 + 90) = 80 ohms

b. total current leaving the battery = i

from ohms law

V = iRrff

i = V/Reff = 8/80 = 0.1 A

c. current through 45 ohm resistor = I

8 - 50i = I*45

I = 0.066667 A

d. P = 1200 W

V = 120 V

current = i

P = Vi

i = P/V = 10 A

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