Basic Electrical Circuit Analysis I Quiz

Answer: femto(f)

The prefix, atto(a), is 10 raised to the power of -18; the prefix, pico(p), is 10 raised to the power of -12; and the prefix, deci(d), is 10 raised to the power of -1. In electrical circuit analysis, the circuit components of voltages, currents, resistances, conductances, etc. are very small; therefore, these prefixes are used quite often with units to describe the magnitude of the component.

Answer: 3000 microcoulombs(C)

2A is the representation for current. 10V is the representation for voltage. 60W is the representation for power. The relationship of an electric charge to voltage, current and power can be represented by the following equations: 1) Voltage(v) = Change in Energy(dw) / Change in Charge(dq), 2) Current(i) = Change in Charge(dq) / Change in time(dt), 3) Power(p) = Change in Energy(dw) / Change in time(dt).

Answer: 10 V power supply

Active elements are electronic devices that can create energy (i.e. voltage supplies and current supplies). Passive elements are electronic devices that cannot create energy (i.e. resistors, capacitors, inductors).

Answer: All of these

Conductance(G) is the inverse of resistance(R): G = 1/R. Siemens is an SI derived unit of measurement for electric conductance named after a German inventor, Werner von Siemens. Mho is a common convention used in professional literature. As you can see Mho is the reverse spelling of Ohm, the unit for resistance. Also, the Greek letter Omega is used as a unit for resistance; therefore, inverting it would make it the unit for conductance.

Answer: Ohm's Law

Ohm's law was established by a German physicist named George Simon Ohm (1789-1854). This law first appeared in a book written by Ohm titled "Die galvanische Kette, mathematisch bearbeitet" (1827). This law states that the potential difference (v) across an ideal conductor is proportional to the current (i) through it. The constant of proportionality is called the resistance (R).

Answer: All of these

The interesting information found in question 2 shows how power is related to voltage and current: p = dw/dt = dw/dq(v) x dq/dt(i). By using variations of Ohm's law (v=iR and i=v/R), the other two equations can also be formed.

Answer: 12.5 kOhm

Knowing that resistors in parallel all contain the same voltage, the following equation can be created using Ohm's law and Kirchhoff's current law: 1/Re = 1/R1 + 1/R2 + 1/R3. This equation could be further expanded if more resistors were added in parallel. The equation would then read 1/Re = 1/R1 + 1/R2 + 1/R3 + 1/R4 + 1/R5 + ...

Answer: 125.0 kOhm

Knowing that resistors in series all contain the same current, the following equation could be created using Ohm's law and Kirchoff's voltage law: Re = R1 + R2 + R3. The equation could be further expanded if more resistors were added in series. The equation would then read Re = R1 + R2 + R3 + R4 + R5 + ...

Answer: Kirchhoff's Current Law

The Node Voltage method is a technique used in solving linear circuits by using Ohm's law and Kirchoff's current law. Kirchhoff's current law states that the sum of all the currents at any node in a circuit equals zero. This law as well as Kirchhoff's voltage law was published in a paper in 1848 by a German physicist, Gustav Robert Kirchhoff (1824-1887).

This law describes the constraints of the relationship between voltages and currents in a circuit.

Answer: Superposition

The principle of superposition is a method that allows a person to activate each source one at a time and sum the resulting voltages or currents to determine the voltages or currents when all the sources are active.
Thevenin and Norton equivalence is the process by which a circuit is replaced with a voltage source and series resistor (Thevenin) or a current source and parallel resistor (Norton).
Source transformation is the process by which a Thevenin equivalent circuit is transformed into a Norton equivalent circuit.