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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
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