Kirchhoff's Rules and Circuits

"Current in a resistor varies in direct proportion to the voltage applied to it and is inversely proportional to the resistor’s value." This is known as what?

• Ohm's Law

• Kirchhoff's Voltage Law

• Kirchhoff's Current Law

• Bolen's Law

"The sum of all voltage drops in a series circuit equals the total applied voltage." This is know as what?

• Ohm's Law

• Kirchhoff's Voltage Law

• Kirchhoff's Current Law

• Bolen's Law

"The total current in a parallel circuit equals the sum of the individual branch currents."

• Ohm's Law

• Kirchhoff's Voltage Law

• Kirchhoff's Current Law

• Bolen's Law

What is the current through R1?

• 10 A

• 5 A

• 7 A

• 2 A

An electrical junction has three wires A, B and C connected to it. Wire A carries 4.2 A going in, wire B carries 2.6 A going out. What does wire C carry?

• 1.6 A going in

• 1.6 A going out

• 6.8 A going in

• 6.8 A going out

An electrical junction has four wires A, B, C and D connected to it. Wire A carries 7A going in, wire B carries 5 A going out and wire C carries 2 A going in. What does wire D carry?

• 10 A going out

• 5 A going out

• 4 A going in

• 4 A going out

Select the correct statement:

• The current in parallel resistors is always equal.

• The sum of the sources of EMF and volt-drops in a closed loop is zero.

• The sum of the currents in a closed loop is zero.

• The sum of the voltages at a node is zero.

There are four resistors in a circuit with an applied voltage of 120V. The voltage drops across three resistors is 15V each. What is the voltage drop across the fourth resistor? 

• 75V
• 120V
• 15V
• 45V

The statement that total current entering a point must equal total current leaving that point best describes _____. 

• Ohm's law 
• Coulomb's total current law 
• Kirchhoff's current law 
• The Theory of Relativity 

For the circuit shown, the resistances are R₁ > R₂ > R_3. What is true about the current through each resistor?

• I₁ = I₂ = I₃

• I₁ > I₂ > I₃

• I₁ > I₃ > I₂

• I₁ < I₃ < I₂

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