Physics 2.1.6

Question 1

Ohm’s Law States that:

Answer 1

The Current through a Conductor is Directly Proportional to the Potential Difference across it.

Question 2

What do you call Electrical Conductors that obey Ohm’s Law?

Answer 2

Ohmic Conductors.

Question 3

What are Ohmic Conductors?

Answer 3

Electrical Conductors that obey Ohm’s Law.

Question 4

3 Common Examples of Ohmic Conductors: (3)

Answer 4

-Fixed Resistors.

-Wires.

-Heating Elements.

Question 5

Which Equation represents Ohm’s Law?

Answer 5

V = IR

Question 6

Ohm’s Law is relevant only at…

Answer 6

Constant Temperatures.

Question 7

What type of Conductor are Filament Lamps?

Answer 7

Non-Ohmic.

Question 8

What is a ‘Non-Ohmic’ Conductor?

Answer 8

An Electric Conductor where the Current and PD are not Directly Proportional.

Question 9

Why are Filament Lamps Non-Ohmic Conductors?

Answer 9

Because the Resistance of the Filament Lamp Increases as the Temp. of the Filament Increases.

Question 10

What is an I-V Graph?

Answer 10

A Graph that shows the relation between Current & PD in a Circuit.

Question 11

What does the I-V Graph for an Ohmic Conductor look like?

Answer 11

A Straight Line that goes through the Origin.

Question 12

What does the I-V Graph for a Filament Lamp show?

Answer 12

It shows the Current Increasing at a Proportionally Slower Rate than the PD.

Question 13

Why does Current Increase at a Proportionally Slower Rate than the PD in a Filament Lamp? (4)

Answer 13

-As the Current Increases, the Temp. of the Filament in the Lamp Increases.

-The Higher Temp. causes the Atoms in the Metal Lattice of the Filament to Vibrate more,

-This causes an Increase in Resistance, as it becomes more difficult for free Electrons (the Current) to pass through.

-Resistance opposes the Current, causing the Current to Increase at a Slower Rate.

Question 14

All Solids are made up of ___ Atoms.

Answer 14

Vibrating.

Question 15

The Higher the Temp. of an Object, the Faster the Atoms will ___.

Answer 15

Vibrate.

Question 16

What happens to the Electric Current through an Object when the Object is Heated up? (4)

Answer 16

-As you Heat up the Object, Atoms will Vibrate more & more.

-Free Electrons (Current) will collide with these Atoms, which impeded their flow.

-Current Decreases.

-Resistance Increases.

Question 17

What type of Conductor are Diodes?

Answer 17

Non-Ohmic.

Question 18

What do Diodes do, and what is it called?

Answer 18

Diodes only allow Current to flow in one Direction only. This is called Forward Bias.

Question 19

Explain the Reverse Direction of Diodes, and give the name.

Answer 19

In the Reverse Direction, the Diode has very High Resistance, and therefore no Current Flows. This is Called Reverse Bias.

Question 20

In the I-V Graph for a Diode, when the Current is in the Direction of the arrowhead Symbol, it is…

Answer 20

Forward Bias.

Question 21

When the Diode is switched around, it is called…

Answer 21

Reverse Bias.

Question 22

Circuit Element I-V Graphs can be either ___ or ___-___.

Answer 22

Linear, Non-Linear.

Question 23

What type of I-V Graph do Circuit Elements that obey Ohm’s Law have?

Answer 23

Linear.

Question 24

What type of I-V Graph do Circuit Elements that do not obey Ohm’s Law have?

Answer 24

Non-Linear.

Question 25

Electric Circuit Elements that have Linear I-V Graphs (Components that obey Ohm’s Law) include: (3)

Answer 25

-Fixed Resistors.
-Wires.
-Heating Elements.

Question 26

Electric Circuit Elements that have Non-Linear I-V Graphs (Components that do not obey Ohm’s Law) include: (4)

Answer 26

-Filament Lamps.
-Diodes & LEDs.
-LDRs.
-Thermistors.