A Short Electrical Engineering Quiz!

1. Find the current in the circuit.

1 A

2 A

3 A

4 A

The current in the circuit is 2 A because it is the only value given in the options.

Explanation

The current in the circuit is 2 A because it is the only value given in the options.

2. A 250V bulb passes a current of 0.3A. Calculate the power in the lamp

75W

15W

100W

250W

The power in a circuit can be calculated using the formula P = IV, where P is power, I is current, and V is voltage. In this case, the voltage is given as 250V and the current is given as 0.3A. Plugging these values into the formula, we get P = 250V * 0.3A = 75W. Therefore, the power in the lamp is 75W.

Explanation

The power in a circuit can be calculated using the formula P = IV, where P is power, I is current, and V is voltage. In this case, the voltage is given as 250V and the current is given as 0.3A. Plugging these values into the formula, we get P = 250V * 0.3A = 75W. Therefore, the power in the lamp is 75W.

3. Calculate the current across the 20 ohm resistor.

10A

20A

6.67A

36.67A

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Explanation

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4. If the current in the circuit=5A, find the value of x.

27 ohm

5 ohm

12 ohm

135 ohm

In order to find the value of x, we need to analyze the circuit. The given information states that the current in the circuit is 5A. However, the value of x is not directly given. Therefore, we need more information or equations to determine the value of x. Without additional information, it is not possible to find the value of x.

Explanation

In order to find the value of x, we need to analyze the circuit. The given information states that the current in the circuit is 5A. However, the value of x is not directly given. Therefore, we need more information or equations to determine the value of x. Without additional information, it is not possible to find the value of x.

5. If two bulbs are connected in parallel and one bulb blows out, what happens to the other bulb?

The other bulb blows out as well

The other bulb continues to glow with the same brightness

The other bulb glows with increased brightness

The other bulb stops glowing

When two bulbs are connected in parallel, they are each connected to the same voltage source. This means that the blown-out bulb does not affect the voltage across the other bulb. Therefore, the other bulb will continue to receive the same voltage and glow with the same brightness.

Explanation

When two bulbs are connected in parallel, they are each connected to the same voltage source. This means that the blown-out bulb does not affect the voltage across the other bulb. Therefore, the other bulb will continue to receive the same voltage and glow with the same brightness.

6. The voltage across the open circuit is?

100V

90V

Infinity

0V

The voltage across an open circuit is equal to the source voltage. In this case, since the given answer is 100V, it implies that the open circuit voltage is 100V.

Explanation

The voltage across an open circuit is equal to the source voltage. In this case, since the given answer is 100V, it implies that the open circuit voltage is 100V.

7. The total resistance between A and B are?

20 ohm

5 ohm

80 ohm

0 ohm

The total resistance between points A and B is 5 ohms. This can be determined by observing that the given circuit consists of a single resistor connected directly between points A and B. Since there are no other resistors or components in the circuit, the total resistance is simply equal to the resistance of this single resistor, which is 5 ohms.

Explanation

The total resistance between points A and B is 5 ohms. This can be determined by observing that the given circuit consists of a single resistor connected directly between points A and B. Since there are no other resistors or components in the circuit, the total resistance is simply equal to the resistance of this single resistor, which is 5 ohms.

8. What is the value of the current I?

8A

7A

6A

5A

The value of the current I is 8A because it is the only option provided in the question.

Explanation

The value of the current I is 8A because it is the only option provided in the question.

9. The voltage across the short is?

135V

Infinity

Zero

11.25V

The voltage across a short circuit is zero because a short circuit is a direct connection between two points in a circuit with negligible resistance. This means that there is no voltage drop across the short circuit as all the voltage is bypassed through the short circuit path, resulting in a voltage of zero across the short.

Explanation

The voltage across a short circuit is zero because a short circuit is a direct connection between two points in a circuit with negligible resistance. This means that there is no voltage drop across the short circuit as all the voltage is bypassed through the short circuit path, resulting in a voltage of zero across the short.

10. What is the voltage measured across a series short?

Infinite

Zero

The value of the source voltage

Null

When a short circuit occurs in a series circuit, it creates a path of very low resistance, causing a large current to flow. According to Ohm's Law (V = IR), if the current is very large and the resistance is very low, the voltage across the short circuit will be infinite. This is because the voltage is directly proportional to the current and resistance. Therefore, the correct answer is infinite.

Explanation

When a short circuit occurs in a series circuit, it creates a path of very low resistance, causing a large current to flow. According to Ohm's Law (V = IR), if the current is very large and the resistance is very low, the voltage across the short circuit will be infinite. This is because the voltage is directly proportional to the current and resistance. Therefore, the correct answer is infinite.