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BLM 5.2 Answer key Ohm’s law worksheet Problem #1: A smartphone with a resistance of 35 ohms has a current of 0.25 amps flowing through it. Sketch a circuit diagram and calculate how many volts supply the smart phone. V= I x R = 0.25 A x 35 Ω = 8.75 V Problem #2: A 120-volt power source supplies a computer with a resistance of 210 ohms. What is the current flow of the circuit? V I = R = 120 V 210 Ω = 0.57 A Problem #3: Calculate the resistance of the following circuit diagram. R= A Current = 100 A = Voltage = 3 V – 94 | + Energy Investigations Teacher Resource Guide V I 3V 100 A = 0.03 Ω Problem #4 What amount of voltage would you need to run a current of 1.2 amps through a 250-ohm resistor? V= I = 1.2 A x R x 250 Ω = 300 V Problem #5 Using the given variables, calculate the unknown value: a. V = 10 V R=5Ω I=2A b. V = 3.5 V R = 10 Ω I = 0.35 A or 350 mA c. V = 10 V I=2A R=5Ω d. V = 3.5 V I = 0.5 A R=7Ω e. I = 11 A R=3Ω V = 33 V f. I=7A R = 4.5 Ω V = 31.5 V Energy Investigations Teacher Resource Guide | 95