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NASA-Threads Electricity & Magnetism Lesson 17: Ohm’s Law Homework 1. A student found that the current through a 100Ω resistor was 0.1 A. What would be the voltage across the resistor? 2. A student measured a current of 25mA through a 220Ω resistor. What would be the voltage across the resistor? 3. An engineer set up a circuit with a 6V battery source. If she puts a 150Ω resistor in series with the batteries, what current should she measure? Express your answer in both amps and milli-amps. 4. A physicist set up a circuit with a single AA battery. If he puts a 10kΩ resistor in series with the battery, what current should he measure? 5. A student connected a 3V battery source to a resistor. If she measures a current of 10mA, what would be the value of resistance? 6. An engineer connected a 4.5V battery source to a resistor and measured a current of 0.05A. The engineer then decided to replace battery pack with a 6V source. If the engineer wants to maintain a current of 0.5A, what would be (a) the original value of resistance, and (b) the value of the new resistor? NASA-Threads Electricity & Magnetism Lesson 17: Ohm’s Law Homework Solution 1. A student found that the current through a 100Ω resistor was 0.1 A. What would be the voltage across the resistor? V IR V 0.1A 1000 V 100V 2. A student measured a current of 25mA through a 220Ω resistor. What would be the voltage across the resistor? V IR V 25mA 1A 220 1000mA V 5.5V 3. An engineer set up a circuit with a 6V battery source. If she puts a 150Ω resistor in series with the batteries, what current should she measure? V R 6V I 150 I .04 A I I .04 A 1000mA 1A I 40mA 4. A physicist set up a circuit with a single AA battery. If he puts a 10kΩ resistor in series with the battery, what current should he measure? V 1.5V V R 1.5V 1k I 10k 1000 I .00015 A I NASA-Threads Electricity & Magnetism Lesson 17: Ohm’s Law 5. A student connected a 3V battery source to a resistor. If she measures a current of 10mA, what would be the value of resistance? V I 3V 1000mA R 10mA 1A R 300 R 6. An engineer connected a 4.5V battery source to a resistor and measured a current of 0.05A. The engineer then decided to replace battery pack with a 6V source. If the engineer wants to maintain a current of 0.5A, what would be (a) the original value of resistance, and (b) the value of the new resistor? V I 4.5V R1 .05 A R1 90 R 6V .05 A R2 120 R2