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Tutorial 1 – Current, Voltage and Resistance TUTORIAL 1 CURRENT, VOLTAGE AND RESISTANCE 1. Using Ohm’s Law, find the value of the quantity omitted across each line of the following table. V 64V 9V 36V 120V 3.8V 450mV 0.2kV I 1.5A 0.36A 8mA 76µA R 16Ω 23 Ω 25 kΩ 1.5MΩ 4.7kΩ 0.03kΩ 800mA 5200pA 1.85MΩ 2. The current in an electric heater is 0.6A when it is plugged into a 120V source. What is the resistance of the heater? What current would flow in the heater if the voltage dropped by 10%? 3. The resistance of an electronic component changes from 860Ω to 1.5kΩ when its temperature changes over a certain range. If it is desired to maintain 30mA of current in the component at all times, what range of voltages must a voltage source connected to it be capable of providing? 4. What is the voltage across a 1.2MΩ resistor if 4.5µC of charge passes through it in 30ms? 5. V How would you configure this circuit to measure the current through the resistor, and the voltage across the resistor? Explain how and why you would use red and black cables for this purpose. R EE1420 Electronics Technology Dr. Daniel Nankoo 1 of 1