The unit of capacitance is the farad (F). Capacitance measures a capacitor’s ability to store charge. One farad is the capacitance when one coulomb of charge causes a one-volt potential difference across the capacitor.
What is the primary role of an inductor in a circuit?
A Store charge
B Limit current
C Store energy
D Measure voltage
An inductor stores energy in a magnetic field when current flows through it. It resists changes in current and releases energy when the current decreases. Inductors are used in filters and transformers.
Which of the following is a non-ohmic conductor?
A Copper
B Diode
C Gold
D Aluminum
A diode is a non-ohmic conductor, meaning it does not follow Ohm’s Law. The current-voltage relationship is nonlinear, allowing current to flow in one direction and blocking it in the opposite direction.
Which electrical quantity is measured in volts?
A Voltage
B Current
C Resistance
D Power
Voltage is the electrical potential difference between two points and is measured in volts (V). It provides the driving force that causes current to flow through a circuit. Voltage is calculated as the energy per unit charge.
What type of circuit is used when the components are connected in a single path?
A Parallel
B Open
C Series
D Short
A series circuit connects components in a single path. The current flows through each component one after the other. If one component fails, the entire circuit is broken. The total resistance is the sum of individual resistances.
What is the primary function of a transformer?
A Store energy
B Change current
C Change voltage
D Measure power
A transformer is used to either increase or decrease the voltage in an alternating current (AC) circuit. It operates based on the principle of electromagnetic induction and changes the voltage without affecting the frequency.
Which of the following is the unit for electrical power?
A Ampere
B Volt
C Watt
D Ohm
The unit of electrical power is the watt (W). It is the rate at which electrical energy is consumed or produced. Power is calculated as the product of voltage and current: P = V × I.
Which component resists the flow of current in a circuit?
A Resistor
B Capacitor
C Inductor
D Battery
A resistor resists the flow of electric current in a circuit. It is used to limit the current, control voltage levels, or protect components from excessive current. Resistance is measured in ohms (Ω).
Which type of current is supplied by batteries?
A Alternating Current
B Direct Current
C Pulsating Current
D Reactive Current
Direct current (DC) is supplied by batteries. DC flows in one direction, making it ideal for devices that require a stable and unidirectional flow of current, such as mobile phones and laptops.
Which device is used to measure the resistance of a component?
A Ammeter
B Wattmeter
C Ohmmeter
D Voltmeter
An ohmmeter is used to measure the resistance of a component or circuit. It works by applying a small voltage and measuring the resulting current, then calculating the resistance using Ohm’s Law.
Which material is commonly used for electrical conductors?
A Rubber
B Glass
C Plastic
D Copper
Copper is widely used as an electrical conductor due to its excellent conductivity and low resistance. It is ideal for use in wires and cables that transport electricity in both household and industrial applications.
What is the unit of electrical resistance?
A Volt
B Ohm
C Ampere
D Watt
The unit of electrical resistance is the ohm (Ω). Resistance is a measure of how much a material opposes the flow of electric current. It depends on the material, length, and cross-sectional area of the conductor.
What does a battery store?
A Energy
B Current
C Voltage
D Resistance
A battery stores chemical energy, which is converted into electrical energy when the battery is connected to a circuit. The stored energy powers electrical devices by providing a flow of direct current (DC).
What is the typical use of a diode in a circuit?
A Limit current
B Store charge
C Convert AC to DC
D Change voltage
A diode is used to convert alternating current (AC) to direct current (DC). It allows current to flow in one direction only, which is essential in power supplies and rectifiers.
What does a voltmeter measure?
A Voltage
B Resistance
C Current
D Power
A voltmeter measures the voltage (or electrical potential difference) between two points in a circuit. It is connected in parallel with the component whose voltage is to be measured. The unit of voltage is the volt (V).