Basic Components of Electric Circuits

What is the unit of measurement for electric current?

• B

• A

• C

• D

Define voltage in an electric circuit.

• Voltage is the resistance in an electric circuit.

• Voltage is the brightness of a light bulb in a circuit.

• Voltage is the potential difference between two points in an electric circuit.

• Voltage is the amount of current flowing through a circuit.

Explain the function of a resistor in a circuit.

• A resistor in a circuit is used to limit the flow of current, control voltage levels, divide voltages, and protect components from excessive current.

• A resistor in a circuit is used to amplify voltage levels

• A resistor in a circuit is used to store electrical energy

• A resistor in a circuit is used to increase the flow of current

How does a capacitor store and release electrical energy?

• By converting light energy into electrical energy

• By generating heat and converting it into electrical energy

• By emitting sound waves that transform into electrical energy

• By accumulating opposite charges on its plates and releasing them when connected to a circuit.

What is the purpose of an inductor in an electric circuit?

• To decrease the resistance in the circuit

• To store energy in the form of a magnetic field and resist changes in current flow.

• To generate heat in the circuit

• To amplify the current flow

What is Ohm's Law and how is it used in circuit analysis?

• Ohm's Law only applies to DC circuits, not AC circuits

• Ohm's Law states that current is inversely proportional to resistance

• Ohm's Law is used to calculate the power dissipated in a circuit

• Ohm's Law is a fundamental principle in electrical engineering that relates the current, voltage, and resistance in a circuit.

Differentiate between AC and DC circuits.

• AC circuits use alternating current, DC circuits use direct current.

• DC circuits use alternating current, AC circuits use direct current.

• AC circuits use direct current, DC circuits use alternating voltage.

• AC circuits use direct current, DC circuits use alternating current.

Describe the concept of impedance in an electric circuit.

• Impedance is the same as resistance in an electric circuit.

• Impedance in an electric circuit is the measure of opposition to the flow of alternating current. It consists of resistance, inductance, and capacitance, and is represented by a complex number.

• Impedance is not affected by inductance in an electric circuit.

• Impedance only consists of resistance and capacitance in an electric circuit.

What role does a diode play in a circuit?

• A diode ensures current flows in one direction only in a circuit.

• A diode stores energy in a circuit

• A diode increases resistance in a circuit

• A diode regulates voltage in a circuit

How does a transformer work in an electrical system?

• A transformer converts mechanical energy into electrical energy.

• A transformer generates electricity from renewable sources.

• A transformer regulates the flow of current in a circuit.

• A transformer transfers electrical energy between circuits through electromagnetic induction.