Understanding Potentiometers

This video tutorial explains the function and applications of potentiometers, which are variable resistors used to control current, voltage, and signal attenuation in circuits. It covers the structure of potentiometers, including their three terminals, and how resistance changes as the knob is turned. The video also demonstrates how potentiometers can be used in voltage divider circuits, sound volume control, and brightness adjustment for light bulbs. Additionally, it highlights other potential uses, such as in oscillators for frequency control.

What is the primary function of a potentiometer in a circuit?

• To store electrical energy

• To act as a variable resistor

• To decrease the current

• To increase the voltage

How does the resistance between points A and B change when a potentiometer is turned clockwise?

• It increases

• It remains the same

• It fluctuates randomly

• It decreases

If a potentiometer is set to the halfway point, what is the resistance between points A and B if the total resistance is 100 kilo ohms?

• 25 kilo ohms

• 50 kilo ohms

• 100 kilo ohms

• 75 kilo ohms

In a voltage divider circuit using a potentiometer, what happens to the output voltage if the knob is turned towards point C?

• The output voltage becomes zero

• The output voltage increases

• The output voltage remains constant

• The output voltage decreases

What is the output voltage when a potentiometer is set at the 25% mark in a voltage divider circuit with a 12V input?

• 12 volts

• 9 volts

• 6 volts

• 3 volts

How can a potentiometer be used in an audio circuit?

• To control the volume

• To increase the frequency

• To amplify the signal

• To store sound waves

In a brightness control circuit, what happens to the light bulb's brightness if the resistance is decreased?

• The brightness turns off

• The brightness increases

• The brightness remains the same

• The brightness decreases

Which terminals are used in a potentiometer when it is employed as a variable resistor for brightness control?

• Terminals A and B

• Terminals B and C

• Terminals A and C

• All three terminals

What is one additional application of potentiometers mentioned in the video?

• To store electrical energy

• To control the frequency in oscillators

• To increase the power output

• To convert AC to DC

What is the effect of adjusting resistance in a circuit using a potentiometer?

• It increases the circuit's inductance

• It modifies the effect of a resistor

• It alters the circuit's capacitance

• It changes the circuit's frequency