Ohm's Law and Circuits

Question 1

what are then units of Ampere?

Answer 1

C/S or charge/time

Question 2

What are the units of current?

Answer 2

Ampere or charge/time = C/sec

Question 3

What are two equations for power?

Answer 3

P = IV or I^2R

Question 4

What is a DC circuit?

Answer 4

single direction flow current - direct current

Question 5

How can you think of electrical potential related

Answer 5

think of it as gravitational potential energy rolling down a hill

• go from positive to negative is like going from high potential energy to lower
• R = V/I > relationship between voltage and current

Question 6

What are the units for Faraday?

Answer 6

coulumb / volt

Question 7

What is the equation for capacitance and C’?

Answer 7

C = free perm Area/Distance 
C' = C *k (dieletric constant)

Question 8

Resistors vs Capacitors in series and parallale

Answer 8

Resistors in series:
- add them up for total total R
Resistors in parallel:
- are equal and are 1/R

Capacitors in series:
- adding in series adds to voltage drop, so 1/C
Capacitors in parallel:
- add them up for total

Question 9

Where is a volmeter measured?

Answer 9

• in parallel to minimize resistance added to the circuit

- has infinite resistance to not pull current

Question 10

Ammometer:

Answer 10

• in series with point, resistance negligble

Question 11

Ohmsmeter

Answer 11

• in serires or parallel, has known resistance

Question 12

A uniform electrical field equation:

Answer 12

E = V/D

Question 13

Potential energy equation of capacitance? what equation is this related to?

Answer 13

PE = 1/2CV^2

• similar to formula for kinetic energy
• stored potential energy