Ohm's Law and Circuits Flashcards

1
Q

what are then units of Ampere?

A

C/S or charge/time

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2
Q

What are the units of current?

A

Ampere or charge/time = C/sec

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3
Q

What are two equations for power?

A

P = IV or I^2R

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4
Q

What is a DC circuit?

A

single direction flow current - direct current

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5
Q

How can you think of electrical potential related

A

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
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6
Q

What are the units for Faraday?

A

coulumb / volt

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7
Q

What is the equation for capacitance and Cā€™?

A
C = free perm Area/Distance 
C' = C *k (dieletric constant)
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8
Q

Resistors vs Capacitors in series and parallale

A

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

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9
Q

Where is a volmeter measured?

A
  • in parallel to minimize resistance added to the circuit

- has infinite resistance to not pull current

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10
Q

Ammometer:

A
  • in series with point, resistance negligble
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11
Q

Ohmsmeter

A
  • in serires or parallel, has known resistance
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12
Q

A uniform electrical field equation:

A

E = V/D

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13
Q

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

A

PE = 1/2CV^2

  • similar to formula for kinetic energy
  • stored potential energy
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