University:
California Institute of Technology
Course:
EE/APh 40 | Physics of Electrical Engineering
Academic year:

2024
Views:

211

Pages:

2
Author:

Elisa Morris

Worksheet - Circuits - Ohm's Law & Power 1. 2. Name: 𝐼= 𝑉 = 𝐼𝑅 3I = ______ V ½ I = ______ V 3.5I & 2R = ______ V 8R = ______V 4V = ______ I 6V & 6R = ______ I 3.7I = ______V ⅓ R = ______ I ½ V & 2R = ______ I V = _______ V = 12 V V=5V V=6V I=3A I = _______ I = 2 mA I = _______ R=5Ω R=3Ω R = _______ R = 2 kΩ 𝑉 𝑅 3. A 1.5 V battery is connected to a small light bulb with a resistance of 3.5 Ω. What is the current in the bulb? 4. The current in a microwave oven is 6.25 A. If the resistance of the oven’s circuitry is 19.2 Ω, what is the voltage? 5. A television draws 2.5 A of current when connected across a potential difference of 120 V. What is the resistance? 6. Which of the following will have more current running through it? 120 V and 3000 Ω of resistance OR 12 V and 3000 Ω of resistance 120 V and 3000 Ω of resistance OR 120 V and 1500 Ω of resistance 6 V and 3000 Ω of resistance OR 12 V and 1500 Ω of resistance 6 V and 3000 Ω of resistance OR 12 V and 6000 Ω of resistance Worksheet - Circuits - Ohm's Law & Power 7. Name: 𝑃 = 𝐼𝑉 2I = ______ P ¼ I = ______ P 2I & 3V = ______ P 2.2 V = ______ P ⅙ V = ______ P 3I & 1/4V = ______ P If the voltage doubles, what has to happen to the current to keep power constant? 8. P = _______ P = 20 W P = 12 MW P = .15 W I=3A I = _______ I = 1000 A I = _______ V=6V V=5V V = _________ V=5V 9. A 1050 W electric toaster operates on a household circuit of 120 V. A) What is the current through the wire? B) What is the resistance of the wire that makes up the heating element in the toaster? 10. A calculator is rated at 0.1 W and 33.3 mA flows out of the battery. A) What is the voltage of the battery? B) What is the resistance of the calculator? 11. A 75 W computer runs for 24 hours. A) How many kilowatt-hours of energy are used? B) If electrical energy costs $0.10 per kW-hr, how much will it cost to run this stereo for on month? 12. Which of the following has a higher power rating? 12 V and 2 A OR 12 V and 4 A 12 V and 2 A OR 6 V and 2 A 12 V and 2 A OR 6 V and 4 A 12 V and 2 Ω OR 12 V and 4 Ω 12 V and 2 Ω OR 24 V and 4 Ω 3 A and 3 Ω OR 3 A and 6 Ω 13. BONUS: Compare the cost of running a 100 W incandescent bulb for 8 hours per day for a year vs. a 23 W compact fluorescent bulb for the same time.