Module 2: Electricity

Question 1

What is conductance (g)?

Answer 1

The ease at which electrical charged particles can flow. Measured in Siemens.

Question 2

What is Resistance? (R)

Answer 2

How difficult it is for electrical charged particles to flow. Measured in Ohms.

Question 3

What is the relationship between conductance and resistance?

Answer 3

The relationship is inverse: more conductance means less resistance and more resistance means less conductance.

R=1/g or g=1/R

Question 4

What is voltage differential?

Answer 4

When there is a difference in charge between point A and point B. This energy is stored.

Question 5

What is the equation to determine electrical potential?

Answer 5

DV = VA - VB

Question 6

What is an electrical current?

Answer 6

When there is a voltage differential between two points that forces the charged particles to move. The reference direction of charged particles is assigned and must stay consistent.

Question 7

What is current? (I)

Answer 7

The rate of flow. It is proportional to the voltage differential and conductance. If current is doubled, then conductance is doubled.

Question 8

Define Ohm’s law.

Answer 8

The voltage across the conductor is directly proportional to the current flowing through.

Question 9

What are Ohm’s law equations?

Answer 9

I=DVxg

I=DV/R or DV=IxR

Question 10

What are the rules for multiple resistances in a series?

Answer 10

1. Add the resistances
2. Currents are equalled.
3. Sum the voltage

Question 11

What are the rules for multiple resistance in a parallel circuit?

Answer 11

1. Add the currents (there are multiple routes)
2. Add conductances (because there are more than one path, (g) might have different conductances.
3. DV is the same. One voltage.
4. Larger current will go through where there is higher conductance. Therefore, I1xR1=I2xR2.

Question 12

What is capacitance? (F)

Answer 12

The property of an electrical conductor, ability to store charge. Charge (q) is proportional to capacitance.

Question 13

What are the properties of a good conductor?

Answer 13

Higher conductance = shorter object and larger surface area.

Question 14

What are the properties of a poor conductor?

Answer 14

Lower conductance = longer object and smaller surface area.

Question 15

Describe a simple resistance circuit.

Answer 15

When the switch is open, there is infinite resistance, no current passes through. Close the switch, voltage moves across.

Question 16

Describe the characteristics of a parallel circuit.

Answer 16

Both/all paths connect directly to the battery (e). Therefore, there are multiple routes for current to flow.

Question 17

Describe the characteristics of a series circuit.

Answer 17

The path is connected to each other, reducing the voltage.

Question 18

How can you represent the inverse relationship of conductance and resistance?

Answer 18

R=1/g or g=1/r