Chapter 6- Circuits

Question 1

Current

Answer 1

I= Q/🔺t

Unit- Ampere (1A= 1C/s)

Question 2

Electromotive force (emf)

Answer 2

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

Question 3

Kirchhoffs 2 rules

Answer 3

1. I(into junction) = I(leaving junction)

2. V(source) = V(drop)

Question 4

Resistance

Answer 4

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

Question 5

Temperature and resistance

Answer 5

Hotter = greater resistance

Question 6

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

Answer 6

V = IR

Question 7

Power

Answer 7

W/t = 🔺E/t

Question 8

Power of resistor

Answer 8

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

Question 9

Voltage in parallel pathways

Answer 9

Voltage is the same everywhere and current differs

Question 10

Capacitance (general equation)

Answer 10

C = Q/V
(Charge/voltage)

SI unit- farad

Question 11

Capacitance of parallel plate capacitor

Answer 11

C= € (A/d)

€- permittivity of free space

Question 12

Uniform electric field within the parallel plates of the capacitor

Answer 12

E= V/d

Question 13

Potential energy stored in a capacitor

Answer 13

U= (1/2)CV^2

Question 14

Dielectric material

Answer 14

Insulation. Can never decrease capacitance.

Question 15

Capacitance due to dielectric material

Answer 15

C* = kC

k- dielectric constant