Understanding Circuit Components and Potential Dividers

What is the primary function of a potential divider in a circuit?

• To increase the current flow

• To divide the total voltage across different resistors

• To decrease the resistance

• To increase the power output

How does a light-dependent resistor (LDR) behave when exposed to bright light?

• Its resistance increases

• Its resistance decreases

• It stops conducting

• It becomes a short circuit

What is the relationship between temperature and resistance in a thermistor?

• Exponential relationship

• Inverse relationship

• Direct relationship

• No relationship

What is a potentiometer primarily used for in a circuit?

• To decrease voltage

• To increase current

• To adjust resistance

• To measure voltage

In a potential divider, what happens to the voltage across a resistor if its resistance is increased?

• The voltage decreases

• The voltage becomes zero

• The voltage remains the same

• The voltage increases

What is the effect of increasing R2 in a potential divider circuit on the voltage across R1?

• The voltage across R1 increases

• The voltage across R1 decreases

• The voltage across R1 remains the same

• The voltage across R1 becomes zero

In a potential divider circuit, if R1 is larger than R2, what can be said about the voltage across R1?

• It is less than half of the total voltage

• It is more than half of the total voltage

• It is equal to the total voltage

• It is zero

What is the resistance of a thermistor in the heat of a fire?

• 100 ohms

• 650 ohms

• 0.25 ohms

• 10 ohms

In a circuit with a light-dependent resistor, what condition will cause the electronic switch to turn on a light?

• When the potential difference is below 7 volts

• When the potential difference is above 7 volts

• When the resistance is at its maximum

• When the current is zero

What is the resistance of a light-dependent resistor in low light conditions?

• 140 ohms

• 8 ohms

• 200 ohms

• 50 ohms