Understanding Transistors and Potential Dividers

What is the primary function of a transistor in an automatic switch?

• To generate power

• To increase voltage

• To control current flow

• To decrease resistance

How does the base current affect the collector current in a transistor?

• It increases the resistance

• It controls the collector current

• It decreases the collector current

• It has no effect

What happens to the brightness of a bulb when the collector current increases?

• The brightness remains the same

• The brightness decreases

• The bulb turns off

• The brightness increases

In a potential divider, how is voltage shared between resistors?

• Equally among all resistors

• Only to the smallest resistor

• Only to the largest resistor

• Based on the resistance of each resistor

What is the total voltage shared by resistors in a series circuit with a 12V EMF?

• 6V

• 0V

• 12V

• 24V

How do you calculate the voltage across a resistor using the potential divider formula?

• Add the resistance to the total voltage

• Subtract the resistance from the total voltage

• Divide the resistance by the total resistance and multiply by the EMF

• Multiply the resistance by the total voltage

What is the resistance of a light-dependent resistor in complete darkness?

• 10 ohms

• 1 million ohms

• 100 ohms

• 1 ohm

How does the resistance of an LDR change in bright light?

• It doubles

• It increases significantly

• It decreases significantly

• It remains constant

What is the effect of light on the resistance of a photoresistor?

• Light has no effect

• Light doubles the resistance

• Light decreases the resistance

• Light increases the resistance

What is the role of a potential divider in an automatic switch circuit?

• To generate power

• To decrease the voltage

• To control the current

• To increase the current