Circuit Theory

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Q. According to Kirchhoff's Current Law (KCL), the sum of currents entering a junction is equal to what?
  • A. The sum of currents leaving the junction
  • B. The total voltage at the junction
  • C. The total resistance at the junction
  • D. Zero
Q. According to Kirchhoff's Current Law (KCL), what can be said about the current entering a junction?
  • A. It must equal the current leaving the junction.
  • B. It can be greater than the current leaving.
  • C. It can be less than the current leaving.
  • D. It has no relation to the current leaving.
Q. According to Kirchhoff's Current Law (KCL), what can be said about the currents entering and leaving a junction?
  • A. They are always equal
  • B. They can be different
  • C. They depend on voltage
  • D. They are always zero
Q. According to Kirchhoff's Current Law (KCL), what must be true at a junction in an electrical circuit?
  • A. The sum of voltages is zero
  • B. The sum of currents entering equals the sum of currents leaving
  • C. Power is conserved
  • D. Resistance is constant
Q. According to Kirchhoff's Current Law (KCL), what must be true at a junction?
  • A. The sum of voltages is zero
  • B. The sum of currents entering equals the sum of currents leaving
  • C. The total power is conserved
  • D. The total resistance is constant
Q. According to Kirchhoff's Current Law (KCL), what must be true at any junction in a circuit?
  • A. The sum of voltages is zero
  • B. The sum of currents entering equals the sum of currents leaving
  • C. Power is conserved
  • D. Current is constant throughout the circuit
Q. According to Kirchhoff's Current Law (KCL), what must be true at any junction in an electrical circuit?
  • A. The sum of currents entering equals the sum of currents leaving
  • B. The voltage is constant
  • C. The total resistance is zero
  • D. Power is conserved
Q. According to Kirchhoff's Voltage Law (KVL), the sum of the voltages around a closed loop is equal to what?
  • A. Zero
  • B. The total current
  • C. The total resistance
  • D. The power consumed
Q. How do you calculate the total power in a resistive AC circuit?
  • A. P = V^2 / R
  • B. P = I^2 * R
  • C. P = V * I * cos(φ)
  • D. P = R * I
Q. How do you calculate the total power in a three-phase AC system?
  • A. P = √3 * V * I
  • B. P = V * I
  • C. P = 3 * V * I
  • D. P = V^2 / R
Q. If a capacitor has a capacitance of 10μF and is charged to 5V, what is the stored energy?
  • A. 0.125 mJ
  • B. 0.25 mJ
  • C. 0.5 mJ
  • D. 1 mJ
Q. If a circuit has a 15V source and a total resistance of 3Ω, what is the total power consumed in the circuit?
  • A. 45W
  • B. 75W
  • C. 25W
  • D. 15W
Q. If a circuit has a Norton equivalent current of 2A and a Norton equivalent resistance of 4Ω, what is the Thevenin equivalent voltage?
  • A. 2V
  • B. 4V
  • C. 8V
  • D. 6V
Q. If a circuit has a Norton equivalent current of 2A and a Norton equivalent resistance of 5Ω, what is the equivalent voltage?
  • A. 5V
  • B. 10V
  • C. 15V
  • D. 20V
Q. If a circuit has a Norton equivalent current of 2A and a Norton resistance of 3Ω, what is the Thevenin equivalent resistance?
  • A.
  • B.
  • C.
  • D.
Q. If a circuit has a Norton equivalent current of 3A and a Norton equivalent resistance of 2Ω, what is the equivalent voltage?
  • A. 6V
  • B. 1.5V
  • C. 3V
  • D. 0.5V
Q. If a circuit has a Norton equivalent current of 3A and a Norton equivalent resistance of 4Ω, what is the equivalent voltage?
  • A. 12V
  • B. 7V
  • C. 3V
  • D. 1.5V
Q. If a circuit has a Norton equivalent current of 5A and a Norton equivalent resistance of 2Ω, what is the equivalent voltage across the terminals?
  • A. 10V
  • B. 5V
  • C. 2.5V
  • D. 0V
Q. If a circuit has a Norton equivalent current of 5A and a Norton equivalent resistance of 2Ω, what is the voltage across the terminals?
  • A. 10V
  • B. 5V
  • C. 2.5V
  • D. 0V
Q. If a circuit has a Norton equivalent current of 5A and a Norton equivalent resistance of 2Ω, what is the equivalent voltage?
  • A. 2V
  • B. 5V
  • C. 10V
  • D. 7V
Q. If a circuit has a Norton equivalent of 2A and a load resistance of 8Ω, what is the power delivered to the load?
  • A. 0.5W
  • B. 1W
  • C. 2W
  • D. 4W
Q. If a circuit has a Thevenin equivalent of 15V and a load resistance of 5Ω, what is the load current?
  • A. 3A
  • B. 2A
  • C. 1A
  • D. 0.5A
Q. If a circuit has a Thevenin equivalent of 5V and 10Ω, what is the current through a load resistor of 5Ω connected across the terminals?
  • A. 1A
  • B. 0.5A
  • C. 2A
  • D. 0.25A
Q. If a circuit has a Thevenin equivalent of 5V and a load resistance of 10Ω, what is the load current?
  • A. 0.5A
  • B. 1A
  • C. 2A
  • D. 5A
Q. If a circuit has a Thevenin equivalent resistance of 5Ω and a load of 10Ω, what is the current through the load?
  • A. 0.8A
  • B. 1A
  • C. 1.2A
  • D. 1.5A
Q. If a circuit has a total impedance of 4Ω and a current of 3A, what is the voltage across the circuit?
  • A. 12V
  • B. 10V
  • C. 15V
  • D. 8V
Q. If a circuit has a total impedance of 6Ω and a current of 2A, what is the voltage across the circuit?
  • A. 12V
  • B. 10V
  • C. 8V
  • D. 6V
Q. If a circuit has a total voltage of 120V and a total current of 10A, what is the total power in the circuit?
  • A. 1200W
  • B. 100W
  • C. 10W
  • D. 120W
Q. If a circuit has a voltage of 12V and a resistance of 4Ω, what is the current flowing through the circuit?
  • A. 3A
  • B. 4A
  • C. 12A
  • D. 48A
Q. If the total power in a circuit is 100W and the power factor is 0.8, what is the apparent power?
  • A. 80VA
  • B. 100VA
  • C. 125VA
  • D. 200VA
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