Chapter 10: Electricity and Circuits

Question 1

What is current and it’s equation? What are the units?

Answer 1

The net movement of conductive electrons.
I=(Charge)/Time
Amperes

Question 2

What makes a current move though a wire?

Answer 2

Either the potential difference (emf) at the ends of the wire or the electric field present within the wire.

Question 3

What prevents current from moving within a wire?

Answer 3

Resistance measured in ohms can be found by voltage/current

Question 4

What is another way to calculate resistance?

Answer 4

R=(p)(L/A)

Question 5

What is ohms law?

Answer 5

Voltage=(resistance)(Current)

Question 6

How to calculate resistors in series?

Answer 6

Simply adding them altogether

Question 7

How to calculate resistors in parallel?

Answer 7

Taking the product of both, and then divide by the sum of the two. can only do two at a time

Question 8

What is the difference between DC and AC?

Answer 8

DC allows for the consistent voltage and current. AC allows for various voltage and current to be supplied.

Question 9

How does current move? Electrons?

Answer 9

Electrons move from negative to positive, but current move in the opposite direction

Question 10

What happens when you add resistors in series?

Answer 10

voltage must add together but current is constant

Question 11

What happens when you add resistors in parallel?

Answer 11

voltage is constant, but the current must add together

Question 12

What are kirchoff’s rules?

Answer 12

That if one battery is present the voltage though resistors in series must add up to the total.
2. If resistors in parallel the current must add together to equal what came in.

Question 13

What is the power of a resistor? Power of a battery?

Answer 13

Resistor= I^2R while battery is (IV)

Question 14

How to calculate energy

Answer 14

power*time

Question 15

What is the equation of capacitance? Units?

Answer 15

Charge *voltage (farad)

Question 16

How to calculate capacitance?

Answer 16

(Eo)(A/d) where area is directly proportional and distance is inverse.

Question 17

What is Ed’s formula?

Answer 17

V=E*D

Question 18

What are two things to note about capacitors?

Answer 18

Create a uniform electric field within the two plates, and they do in fact store charge.

Question 19

How to find the energy stored in a capacitor?

Answer 19

PE= (1/2)Q*V

Question 20

What is a dielectric?

Answer 20

An insulating substance that goes between the two capacitor plates to increase the capacitance. (by a factor of K)

Question 21

What happens when you place a dielectric when the capacitor is charging?

Answer 21

No effect on the potential energy, and no effect on the electric field.
Does increase the charge by a factor of K

Question 22

What happens when you place a dielectric when the capacitor is disconnected?

Answer 22

The voltage drops by a value of K along with the electric field value.
There is heat released as a result of PE lost.

Question 23

Calculation of capacitor in series?

Answer 23

1/C1+1/C2

Question 24

Calculation of capacitor in parallel?

Answer 24

Simply add them all together

Question 25

Finding voltage and current with an AC setup?

Answer 25

V/sqrt2 and I/sqrt2