09 Ohm_s law problems - Ohm'slawproblems OhmsLawforResistor...

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Ohm's law problems 1/13/10 © 2010 A. Ganago 1 Ganago’s problems on Ohm’s law Master these concepts for success on homework and exams © 2009 A. Ganago 1 Problems on Ohm's law Ohm’s Law for Resistor For a resistor, current (through) is directly proporMonal to voltage (across) © 2009 A. Ganago Problems on Ohm's law 2 Voltage‐current CharacterisMc Independent Voltage Source Regardless of anything else in the circuit, provides voltage V S between its terminals © 2009 A. Ganago Problems on Ohm's law 3 Voltage‐current CharacterisMc Independent Current Source Regardless of anything else in the circuit, pumps current I S through its terminals © 2009 A. Ganago Problems on Ohm's law 4 Voltage‐current CharacterisMc 4 V 3 A 2 Ω How much power does the voltage source absorb? © 2009 A. Ganago 5 Problems on Ohm's law Choices: + 12 W + 4 W ‐ 4 W ‐ 8 W ‐ 12 W 4 V 3 A 2 Ω Recall KCL, KVL, Ohm’s Law, and the Passive Sign ConvenMon © 2009 A. Ganago 6 Problems on Ohm's law I 4 The absorbed power = P 4V = (4 V) (I 4 )
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Ohm's law problems 1/13/10 © 2010 A. Ganago 2 4 V 3 A 2 Ω By KCL at the top node, 3 A = I 2 + I 4 © 2009 A. Ganago 7 Problems on Ohm's law I 4 I 2 4 V 3 A 2 Ω By KVL (right loop) the voltage across 2 Ω must equal 4 V © 2009 A. Ganago
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