Ohm’s Laws » Exercise – 1
1. Ohm’s law is not applicable to :
(a) semi-conductors.
(b) DC circuits
(c) high currents
(d) small resistors
2. A resistor is connected across a 50 V source. What is the current in the resistor if the color code is red, orange, orange, silver?
(a) 2 mA
(b) 2.2 mA
(c) 214 mA
(d) 21.4 mA
3. An electric heater draws 3.5 A from a 110 V source. The resistance of the heating element is approximately ________.
(a) 385 Ω
(b) 38.5 Ω
(c) 3.1 Ω
(d) 31 Ω
4. If 750 µA is flowing through 11 kΩ of resistance, what is the voltage drop across the resistor?
(a) 8.25 V
(b) 82.5 V
(c) 14.6 V
(d) 146 V
5. The formula to find I when the values of V and R are known is ________.
(a) I = VR
(b) I = R/V
(c) V = IR
(d) I = V/R
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