Grade 11 Electric Current Quiz

1. A 12.0 Ω lamp and a 6.0 Ω lamp are connected in series.
What is the total resistance of the combination?

0.5 Ω

6.0 Ω

18.0 Ω

72.0 Ω

When two resistors are connected in series, the total resistance is equal to the sum of their individual resistances. In this case, the total resistance is the sum of the resistances of the 12.0 Ω lamp and the 6.0 Ω lamp, which is 18.0 Ω.

Explanation

When two resistors are connected in series, the total resistance is equal to the sum of their individual resistances. In this case, the total resistance is the sum of the resistances of the 12.0 Ω lamp and the 6.0 Ω lamp, which is 18.0 Ω.

2. What will this voltmeter register when connected to a battery as shown (assume a battery voltage of 12 volts)?

-10 V

-8 V

-6 V

-12 V

The voltmeter will register -12 V when connected to the battery because the voltmeter is connected in reverse polarity, causing the reading to be negative. Since the battery voltage is 12 V, the voltmeter will display the negative value of the battery voltage, which is -12 V.

Explanation

The voltmeter will register -12 V when connected to the battery because the voltmeter is connected in reverse polarity, causing the reading to be negative. Since the battery voltage is 12 V, the voltmeter will display the negative value of the battery voltage, which is -12 V.

3. The dependence of the Thermistor is

Temperature

Candella

Light

No dependence

The dependence of the thermistor is temperature. A thermistor is a type of resistor whose resistance changes with temperature. As the temperature increases, the resistance of the thermistor decreases, and vice versa. This property makes thermistors useful in temperature sensing and control applications. They are commonly used in thermostats, temperature sensors, and temperature compensation circuits.

Explanation

The dependence of the thermistor is temperature. A thermistor is a type of resistor whose resistance changes with temperature. As the temperature increases, the resistance of the thermistor decreases, and vice versa. This property makes thermistors useful in temperature sensing and control applications. They are commonly used in thermostats, temperature sensors, and temperature compensation circuits.

4. Calculate the value of a resistor in ohms accordingly to the graph, which shows:
- The voltage applied to the resistor.
- The current passing through the resistor

5 ohms

10 ohms

15 ohm

20 ohms

Based on the information provided, the correct answer is 5 ohms. This can be determined by looking at the graph and finding the point where the voltage and current intersect. At this intersection, the value of the resistor can be read as 5 ohms.

Explanation

Based on the information provided, the correct answer is 5 ohms. This can be determined by looking at the graph and finding the point where the voltage and current intersect. At this intersection, the value of the resistor can be read as 5 ohms.

5. Fixed resistance has

No dependence

Light

Candella

Option 4

The answer "No dependence" suggests that fixed resistance does not depend on any external factors or variables. It remains constant and does not change regardless of other conditions such as voltage or current. This characteristic of fixed resistance makes it predictable and reliable in electrical circuits.

Explanation

The answer "No dependence" suggests that fixed resistance does not depend on any external factors or variables. It remains constant and does not change regardless of other conditions such as voltage or current. This characteristic of fixed resistance makes it predictable and reliable in electrical circuits.

6. The diagram shows a circuit with three ammeters, X, Y, and Z.

A

B

C

D

not-available-via-ai

Explanation

not-available-via-ai

7. Four lamps are labeled ‘60 W 240 V.’
In which circuit are the lamps connected so that they all work at normal brightness?

A

B

C

D

In circuit A, the lamps are connected in parallel. This means that each lamp has its own separate branch connected directly to the power source. In this configuration, each lamp receives the full voltage of 240 V, allowing them to operate at their normal brightness.

Explanation

In circuit A, the lamps are connected in parallel. This means that each lamp has its own separate branch connected directly to the power source. In this configuration, each lamp receives the full voltage of 240 V, allowing them to operate at their normal brightness.

8. "Same current and the voltage splits," which kind of circuit meets this condition.

Series

Parallel

Both 1 and 2

Neither 1 nor 2

In a series circuit, the current passing through each component is the same. Additionally, the voltage across the components in a series circuit is divided among them. This means that the statement "Same current and the voltage splits" accurately describes a series circuit, where the current is constant and the voltage is divided across the components. Therefore, the correct answer is series.

Explanation

In a series circuit, the current passing through each component is the same. Additionally, the voltage across the components in a series circuit is divided among them. This means that the statement "Same current and the voltage splits" accurately describes a series circuit, where the current is constant and the voltage is divided across the components. Therefore, the correct answer is series.

9. Which diagram shows a circuit that will allow the lamps to be switched on and off independently?

A

B

C

D

Diagram D shows a circuit that will allow the lamps to be switched on and off independently. This is because each lamp is connected to its own switch, allowing them to be controlled separately. The switches are connected in parallel, meaning that each switch can control the flow of current to its respective lamp without affecting the other lamps. Therefore, when one switch is turned on, only its corresponding lamp will light up, while the others remain off.

Explanation

Diagram D shows a circuit that will allow the lamps to be switched on and off independently. This is because each lamp is connected to its own switch, allowing them to be controlled separately. The switches are connected in parallel, meaning that each switch can control the flow of current to its respective lamp without affecting the other lamps. Therefore, when one switch is turned on, only its corresponding lamp will light up, while the others remain off.

10. Four lamps are labeled ‘60 W 240 V.’
In which circuit are the lamps connected so that they all work at the lowest brightness?

A

B

C

D

In circuit D, the lamps are connected in series. When lamps are connected in series, the total voltage across the circuit is divided equally among the lamps. Therefore, each lamp receives a lower voltage compared to the other circuits, resulting in lower brightness.

Explanation

In circuit D, the lamps are connected in series. When lamps are connected in series, the total voltage across the circuit is divided equally among the lamps. Therefore, each lamp receives a lower voltage compared to the other circuits, resulting in lower brightness.