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What is the unit of electrical resistance?

 

• Volt
  

• 
  Ampere
  

• 
  Ohm
  

• 
  Watt

What is the purpose of the photoresistor (LDR) in a circuit?

• To control the brightness of the LED

• To measure the resistance of the circuit

• To detect the level of ambient light

• To act as a switch for the transistor

 Which component in a circuit is responsible for limiting the flow of electrons?

A) The LED

B) The NPN transistor

C) The 1M Ohm resistor

D) The 100 Ohm resistor

• The LED

• The NPN transistor

• The 1M Ohm resistor

• The 100 Ohm resistor

Find the equivalent resistance across terminal a - b:

• 20 Ohm

• 14 Ohm

• 28 Ohm

• 7 Ohm

In a transistor

• IC = IE + IB

• IB = IC + IE

•   IE = IC – IB

• IE = IC + IB