Ohm and Kirchhoff laws, series and parallel, nodal and mesh analysis, Thevenin and Norton, superposition and maximum power transfer.
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- What is Ohm's Law?
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V = IR, where V is voltage in volts, I is current in amperes, and R is resistance in ohms- A resistor is 10 ohms and carries 2 amperes. What voltage appears across it?
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20 volts- A 1000 ohm resistor has 5 volts across it. What is the current?
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5 milliamperes (0.005 amperes)- Define conductance and its relationship to resistance
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Conductance G = 1/R, measured in siemens (S); it is the reciprocal of resistance- State Kirchhoff's Voltage Law (KVL)
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The algebraic sum of voltages around any closed loop equals zero- A series circuit has a 12 V source. The first resistor drops 5 V. What is the voltage across the second resistor?
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7 volts- In a closed loop, a 10 V source drives current, a resistor drops 3 V, another drops 4 V. What voltage drop is unaccounted for?
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3 volts- State Kirchhoff's Current Law (KCL)
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The algebraic sum of currents at a node equals zero (current in equals current out)- At a node, 3 A and 2 A flow in. One branch carries 4 A out. What current flows through the remaining branch?
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1 ampere out- In a parallel circuit, the main line carries 10 A. Two branches carry 6 A and 3 A. Find current in the third branch.
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1 ampere- How is total resistance calculated in a series circuit?
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R_total = R1 + R2 + R3 + ... (resistances add directly)- Three resistors of 10 ohm, 20 ohm, and 30 ohm are in series. Find total resistance.
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60 ohms- In a series circuit, what is the voltage divider rule?
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Voltage across resistor R_x is V_x = V_source times (R_x / R_total)- A 100 ohm and 50 ohm resistor are in series with a 15 V source. Find voltage across the 50 ohm resistor.
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5 volts- How is total resistance calculated in a parallel circuit?
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1/R_total = 1/R1 + 1/R2 + 1/R3 + ... (reciprocals add)
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