Electric Circuit Questions

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Very Short Answers Questions [1 Mark Questions]

Ques. A circuit in which components are connected to the same voltage, and the current divides between the various components according to their resistance is known as

1. Parallel circuit
2. Series circuit
3. Combination circuit
4. None of the above

Ans. The correct answer is a. Parallel circuit

Explanation: A parallel circuit is one in which all of the components are connected to the same voltage and the current is divided among them based on their resistance.

Ques. The start of the point from where the electrons start flowing is called

1. Insulator
2. Electrical tape
3. Conductor
4. Source

Ans. The correct answer is d. Source

Explanation: The point where electrons begin to flow is referred to as the source, while the point where electrons leave the electrical circuit is referred to as the return.

Ques. Which of the following laws are used to find the performance of the electric circuit?

1. Newton’s law
2. Plank’s law
3. Ohm’s law
4. Faraday’s law

Ans. The correct answer is c. Ohm’s law

Explanation: Ohm's Law is V = IR, where V denotes voltage, I denotes current, and R denotes resistance. Ohm's Law allows us to determine the characteristics of a circuit, such as how much current is flowing through it, if the values of V and R are known.

Ques. What are the types of switches?

Ans. There are two types of switches. These are

• Electrical switches
• Mechanical switches.

Ques. A switch can be used only to open the circuit and cannot be used to close a circuit.

1. True
2. False

Ans. The correct answer is b. False

Explanation: A switch is a device that changes the direction of current flow in a circuit. It has the ability to open and close an electric circuit.

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Short Answers Questions [2 Marks Questions]

Ques. Define electrical circuit.

Ans. An electrical circuit is a closed path of wires and electrical components that permits current to flow across it when a potential difference between two places in the path is applied.

Ques. List some of the components of analog circuits.

Ans. The components of an analog circuit are

• Transistors
• Inductors
• Wires
• Diodes
• Resistors
• Capacitors

Ques. Define a series-parallel circuit.

Ans. A series-parallel circuit is a circuit in which some of the elements are connected in series while others are connected in parallel, and this arrangement is known as a series-parallel circuit.

Ques. What is a direct-current circuit?

Ans. A direct-current circuit only allows current to flow in one direction. A direct current circuit is an electrical circuit made up of any combination of constant voltage, constant current, and resistors.

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Long Answers Questions [3 Marks Questions]

Ques. What are the properties of series electric circuits?

Ans. The following are the properties of series electric circuits

• The same current flows through all the components connected in series.
• The supply voltage V is represented by the sum of individual voltage drops across each component. i.e. V = V1 + V2 + …. + Vn
• The equivalent electrical resistance is the sum of the individual resistances.
• The equivalent resistance R is the largest of all the separate resistances: R > R1, R > R2, R > R3, R > R4..., R > Rn

Ques. What are the properties of electric circuits?

Ans. The following are the properties of electric circuits

• Circuits are paths that are always closed, indicating that they are always connected.
• A circuit must always include at least one energy source that acts as an electron source.
• Electric elements include unregulated and controlled power, as well as resistors, capacitance, and inductors.
• In an electric circuit, electrons flow from the negative end to the positive end.
• Traditional current moves from the positive to the negative terminal.
• There is a potential decline in the various elements due to the current flow.

Ques. What precautions should be taken while using Electric circuits?

Ans. The precautions that should be taken while using electric circuits are

• When working, always use insulated tools.
• Never operate machinery that has frayed cables, damaged insulation, or broken plugs.
• Know your country's wire code.
• Never use an aluminum or steel ladder to work on a receptacle at an elevated height in your house. An electrical surge will ground you and conduct the entire electric current through your body. Instead, use a bamboo, wooden, or fiberglass ladder.
• When dealing with electricity, stay away from water at all times. Wet hands should never be used to handle or attempt to repair electrical equipment or circuits. It increases electric current conductivity.

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Very Long Answers Questions [5 Marks Questions]

Ques. What are the different types of electric circuits?

Ans. The different types of electric circuits are

• Series Circuit: The components of a series circuit are connected in series, or one after the other, with no wire branching. The current flowing through each component connected in series is the same regardless of how many resistors are contacted along the route.
• Parallel Circuit: A parallel circuit is made up of components that are linked in parallel, which indicates that one point in the circuit is divided into pieces, with wires running to two separate components before rejoining. Each parallel-connected component has the same voltage.
• Open Circuit: An open circuit cannot conduct current because the loop is broken at some point. A "closed circuit" is one in which the full loop has been created and current may flow. Obviously, the latter is more interesting to investigate.
• Short Circuit: A short circuit occurs when the resistive components are bypassed and a considerable quantity of current flows. Circuit breakers are devices that are installed in circuits to "break" (open) the circuit and stop current flow in order to protect the circuit and electronic equipment from damage and to prevent fires.

Ques. Explain the domestic Electric Circuit.

Ans. Electricity is delivered to homes through the mains. 

• It is made up of two wires. 
• The first is a live (positive) wire with red insulation, while the second is a neutral (negative) wire with black insulation.
• The voltage differential between the two wires is 220 volts. 
• The earth wire has green insulation and is attached to a metal plate that is buried.
• Two separate circuits are employed. 
• One is 15A for high-power appliances such as geysers and air conditioners. 
• The other is 5A for fans, lamps, and so on. 
• All of the appliances are interconnected in parallel so that each receives equal voltage and that even if one is turned off, the others are not impacted.
• Appliances with metallic bodies, such as electric irons and refrigerators, are linked to the ground wire so that if there is a leakage of current, it flows to the earth and prevents electric shock.

Ques. What are the properties of parallel electric circuits?

Ans. The following are the properties of parallel electric circuits

• A similar potential difference passes through all of the parallel resistances.
• The entire current is distributed to the number of parallel pathways equal to the number of resistances. The total amount of all individual currents is always the aggregate current (I) i.e. I = I₁ + I₂ +...+ I_n
• The reciprocal of a shunt circuit's equivalent resistance is equivalent to the total of the reciprocals of the individual resistances. 
• The equivalent resistance is the smallest of all the resistances. I.e. R < R₁, R < R₂, R < R₃ …., R < R_n
• The equivalent conductance is the mathematical sum of the separate conductances.
• The equivalent resistance is smaller than the smallest of all the resistances connected in parallel.

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