Chapter 6- Circuits Flashcards Preview

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Flashcards in Chapter 6- Circuits Deck (15)
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1

Current

I= Q/🔺t
Unit- Ampere (1A= 1C/s)

2

Electromotive force (emf)

When no charge is moving between the two terminals of a cell that are at different potential values (units- J/C or V). Energy supplied to electric charge

3

Kirchhoffs 2 rules

1. I(into junction) = I(leaving junction)
2. V(source) = V(drop)

4

Resistance

R= pL/A (units- Ohms)
p- resistivity of material
L- length of resistor
A- cross sectional area

5

Temperature and resistance

Hotter = greater resistance

6

Ohms law (voltage drop between any two points in a circuit)

V = IR

7

Power

W/t = 🔺E/t

8

Power of resistor

P= IV = I^2R = V^2/R

9

Voltage in parallel pathways

Voltage is the same everywhere and current differs

10

Capacitance (general equation)

C = Q/V
(Charge/voltage)

SI unit- farad

11

Capacitance of parallel plate capacitor

C= € (A/d)

€- permittivity of free space

12

Uniform electric field within the parallel plates of the capacitor

E= V/d

13

Potential energy stored in a capacitor

U= (1/2)CV^2

14

Dielectric material

Insulation. Can never decrease capacitance.

15

Capacitance due to dielectric material

C* = kC
k- dielectric constant