Resistor

What is the primary function of a resistor in an electrical circuit?

• A. To increase the current flow

• B. To store electrical energy

• C. To oppose the current flow

• D. To generate voltage

Why are resistors used with LED lights?

• A. To increase brightness

• B. To prevent voltage spikes

• C. To cool the LED

• D. To shorten the LED lifespan

Which of the following is NOT a function of a resistor?

• A. Dividing voltage

• B. Biasing active elements

• C. Amplifying signals

• D. Terminating transmission lines

How many color bands are commonly used on a resistor to indicate its value and tolerance?

• A. 2

• B. 3

• C. 4

• D. 6

What is the resistance value of a resistor with color bands: Red - Violet - Orange - Gold?

• A. 270 ohms

• B. 2.7 ohms

• C. 27,000 ohms

• D. 2,700 ohms
  

Which resistor is most suitable for industrial machines requiring high current?

• C. Wire wound resistor

• B. Carbon film resistor

• A. Metal film resistor

• D. Trimmer resistor

What is one main role of a resistor in a circuit?

• A. Store electricity

• B. Limit current

• C. Produce voltage

• D. Generate electricity

Which component needs a resistor to avoid burning out?

• A. Motor

• D. Switch

• B. LED

• C. Battery

Where are resistors commonly used?

• A. Only in batteries

• B. Only in industrial robots

• C. In many devices like TVs, computers, and medical tools

• D. Only in labs

A light bulb with a resistance of 10Ω is connected to a 3V power supply. What is the current flowing through the bulb?

• 30A

• 0.3A

• 1.0A

• 3.3A