Topic 5: Electric Potential Difference, Current And Resistance

1. What is the symbol used to represent the number of elements in a set?

X

M

N

C

In mathematics, 'n' is commonly used to denote the number of elements in a set, while 'x', 'c', and 'm' do not have the same connotation.

Explanation

In mathematics, 'n' is commonly used to denote the number of elements in a set, while 'x', 'c', and 'm' do not have the same connotation.

2. 5.2.2 Describe the concept of internal resistance.

The resistance in a battery that has no effect on its terminal potential difference

The resistance in a battery that increases its emf output

Resistance inside a battery that causes the battery's terminal potential difference to be less than its emf

The resistance in a circuit caused by external factors such as wires or components

Internal resistance refers to the resistance inside a battery that affects the flow of current and causes a voltage drop between the battery terminals. It is an inherent property of the battery itself.

Explanation

Internal resistance refers to the resistance inside a battery that affects the flow of current and causes a voltage drop between the battery terminals. It is an inherent property of the battery itself.

3. 5.2.4 Draw circuit diagrams.

Use Morse code.

Write a poem about circuits.

See pic

Dance the circuit diagram.

The correct way to handle this question is by visually representing the circuit diagrams through illustrations or sketches.

Explanation

The correct way to handle this question is by visually representing the circuit diagrams through illustrations or sketches.

4. Describe a potential divider.

A mechanism that regulates the current flowing through a circuit.

A circuit element that increases the potential difference of a battery.

A device used to separate the positive and negative terminals of a battery.

Two resistors placed in series that divide up the battery's potential difference

A potential divider, also known as a voltage divider, is a circuit arrangement consisting of two resistors placed in series to divide the battery's potential difference.

Explanation

A potential divider, also known as a voltage divider, is a circuit arrangement consisting of two resistors placed in series to divide the battery's potential difference.

5. What is a Light Dependent Resistor (LDR)?

Photo-conductive cell made of semiconducting material whose resistance decreases as the intensity of the incident light increaseslight decreases --> resistance increasesswitch needs min PD to turn on

A device that emits light when exposed to an electric current.

A component that regulates the voltage in a circuit.

A type of resistor that withstands high temperatures without changing its resistance.

An LDR is a type of resistor that changes its resistance based on the intensity of light it is exposed to, making it a key component in light sensing circuits.

Explanation

An LDR is a type of resistor that changes its resistance based on the intensity of light it is exposed to, making it a key component in light sensing circuits.

6. What does NTC stand for in relation to sensors?

A sensor that increases resistance when exposed to higher temperatures

A sensor that does not require changes in temperature to function

A sensor that is only effective in extreme cold conditions

A sensor made of semiconducting material whose resistance decreases as temp increasestemp increases --> resistance decreasesSwitch needs min PD to turn on

NTC stands for Negative Temperature Coefficient, which means the resistance of the sensor decreases as the temperature increases. It is made of semiconducting material and works based on this principle.

Explanation

NTC stands for Negative Temperature Coefficient, which means the resistance of the sensor decreases as the temperature increases. It is made of semiconducting material and works based on this principle.

7. What is a strain gauge?

A tool used for measuring humidity levels

A long thin metal wire whose resistance increses as it is stretched since it becomes longer and thinnerstrain increases --> resistance increases

A device that measures pressure in a fluid

A sensor that detects temperature changes

A strain gauge is specifically designed to measure the strain in an object by detecting changes in resistance when stretched. It is not used to measure pressure, temperature, or humidity.

Explanation

A strain gauge is specifically designed to measure the strain in an object by detecting changes in resistance when stretched. It is not used to measure pressure, temperature, or humidity.