QUIZ 5

Which of the following best describes an ohmic material?

• It follows Ohm’s Law, and its I-V curve is a straight line.

• It does not obey Ohm’s Law and has a nonlinear I-V curve.

• Its resistance decreases with increasing temperature.

• It only allows current in one direction.

Which of the following is an example of a non-ohmic material?

• Copper wire

• Resistor

• LED (Light Emitting Diode)

• Aluminum wire

What does a linear I-V curve indicate?

• The resistance of the material is constant.

• The material does not allow current to flow.

• The material only allows current in one direction.

• The voltage remains constant regardless of current.

Why does a filament bulb exhibit a curved I-V relationship instead of a straight line?

• The filament cools down as voltage increases.

• The filament follows Ohm’s Law strictly.

• The resistance of the filament increases with temperature.

• The voltage across the filament remains constant.

Which statement is true regarding a diode’s I-V characteristic curve?

• It is a straight line passing through the origin.

• It follows Ohm’s Law in all conditions.

• It has equal current flow in both directions.

• It allows current to flow only after a threshold voltage is reached.

A certain material has an I-V curve that forms a straight line through the origin. What does this imply about the material?

• It is a diode.

• It has constant resistance and obeys Ohm’s Law.

• It is a filament bulb.

• It has variable resistance.

A student measures the current through a resistor at different voltages and finds the following values: What is the resistance of the resistor?

• 1 Ω

• 2 Ω

• 3 Ω

• 4 Ω

A student plots the I-V curve of an unknown component and finds it is a curve rather than a straight line. What does this suggest about the component?

• It is an ohmic material.

• It is a non-ohmic material.

• It has a constant resistance.

• It behaves the same at all voltages.

If a diode is placed in a circuit and the applied voltage is below its threshold voltage, what will happen?

• It will conduct current normally.

• It will allow current to flow in both directions.

• It will not conduct current significantly.

• It will behave like a perfect resistor.

Which of the following I-V graphs represents a non-ohmic material such as a diode?

• A straight line through the origin.

• A horizontal line indicating constant voltage.

• A straight line with varying slopes.

• A curve with a threshold voltage before current increases.