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Questions and Answers

What is the SI unit of electrical resistance?

Ohm (Ω) (correct)
Volt (V)
Ampere (A)
Watt (W)

Electrical conductance is the reciprocal of electrical resistance.

True (A)

According to Ohm's Law, what is the relationship between voltage (V), current (I), and resistance (R)?

V = R * I

The electrical resistance of an object is a measure of its ______ to the passage of electric current.

opposition Signup and view all the answers

Which of the following factors affect the resistance of a uniform object?

Length, cross-sectional area, and resistivity (B) Signup and view all the answers

When replacing a resistance with another one, it's okay to replace it with a lower power than the first one.

False (B) Signup and view all the answers

According to Ohm's Law, what happens to the current flowing through a resistor if the voltage across it is doubled while the resistance remains constant?

The current is doubled. (D) Signup and view all the answers

What instrument is used to directly measure resistance?

Ohm meter Signup and view all the answers

In the resistance color code, the bands on a resistor indicate its resistance value, ______, and tolerance.

multiplier Signup and view all the answers

Variable resistances always have two terminals.

False (B) Signup and view all the answers

What type of resistor changes its resistance based on temperature?

Thermistor (A) Signup and view all the answers

With thermistors, resistance increases as temperature rises.

False (B) Signup and view all the answers

What is the name for a resistor whose resistance decreases with increasing incident light intensity?

Photoresistor Signup and view all the answers

A ______ is an electronic component with an electrical resistance that varies with the applied voltage.

varistor Signup and view all the answers

Carbon composition resistors typically have which tolerance range?

+/- 10% or 20% (A) Signup and view all the answers

What is the primary advantage of wirewound resistors?

Ability to dissipate large amounts of power (B) Signup and view all the answers

Wirewound resistors are best suited for high resistance applications.

False (B) Signup and view all the answers

What material is commonly used in RTDs (Resistance Temperature Detectors)?

Platinum/Nickel/Copper Signup and view all the answers

The resistance of a ______ decreases with increasing incident light intensity.

photoresistor Signup and view all the answers

What is the primary purpose of a varistor in circuit design?

Voltage surge protection (D) Signup and view all the answers

Metal film resistors offer a wider range of resistance values compared to carbon composition.

True (A) Signup and view all the answers

What is indicated by the color bands on a resistor?

Resistance Value/Tolerance Signup and view all the answers

The temperature coefficient (k) of a resistor that is not a thermistor is designed to be as close to ______ as possible.

zero Signup and view all the answers

What is the impact of the cross sectional area on a resistance?

Inversely Proportional (D) Signup and view all the answers

The value of the resistance does not depend on the frequency.

True (A) Signup and view all the answers

Flashcards

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