Understanding Resistors and Their Functions

What is Ohm's Law and how is it expressed mathematically?

• I = V + R

• Ohm's Law is expressed as V = I * R.

• V = R / I

• R = V - I

If a resistor has a resistance of 5 ohms and a current of 2 amps, what is the voltage across it?

• 20 volts

• 5 volts

• 15 volts

• 10 volts

What do the colors on a resistor represent in the resistor color code?

• The colors indicate the resistor's resistance value and tolerance.

• The colors show the maximum voltage the resistor can handle.

• The colors represent the manufacturing date of the resistor.

• The colors indicate the resistor's power rating.

How many bands are typically found on a standard 4-band resistor?

• 2

• 8

• 6

• 4

What is the value of a resistor with the color bands red, red, and brown?

• 470 ohms

• 330 ohms

• 100 ohms

• 220 ohms

What are the main differences between fixed and variable resistors?

• Fixed resistors have a constant resistance; variable resistors can be adjusted.

• Fixed resistors are more expensive than variable resistors.

• Variable resistors are used only in high-power applications; fixed resistors are not.

• Fixed resistors can be adjusted; variable resistors have a constant resistance.

What type of resistor is used to limit current in LED circuits?

• Variable resistor

• Fixed resistor

• Inductor

• Capacitor

What is the purpose of a potentiometer in a circuit?

• To adjust voltage levels or control current flow in a circuit.

• To convert AC to DC voltage.

• To store electrical energy for later use.

• To measure resistance in a circuit.

How does temperature affect the resistance of a thermistor?

• Resistance of a thermistor is only affected by humidity.

• Temperature affects the resistance of a thermistor by causing it to decrease (NTC) or increase (PTC) depending on the type of thermistor.

• Temperature has no effect on thermistor resistance.

• All thermistors have the same resistance regardless of temperature.

What is the significance of tolerance in resistors?

• Tolerance in resistors signifies the allowable deviation from the specified resistance value, ensuring circuit reliability.

• Tolerance is the maximum voltage a resistor can handle.

• Tolerance refers to the temperature range of the resistor.

• Tolerance indicates the physical size of the resistor.