Circuits

Question 1

What is current?

Answer 1

Current is the flow of electric charge.

I = Q/t

units are A or C/s

Question 2

What is ohm’s law?

Answer 2

V=IR

Question 3

What effects resistance?

Answer 3

R = pL/A

Resistance increases with increasing temperatures with most conductors. It is the opposition to the flow of charge

Question 4

1. At any junction within a circuit, the sum of current flowing into that point must equal the sum of the current leaving.
2. The sum of voltage sources equalts the sum of voltage drops around a closed-circuit loop.

Answer 4

These are Kirchoff’s Laws

Question 5

Describe the voltage, current and ressistance in series circuits

Answer 5

R_eq = R₁ + R + R ……

V_T = V₁ + V₂ + V3 + …….

I_T = I₁ = I₂ = I_{3 =} …….

Question 6

Describe a circuits’voltage, resistance, and currentl in parallel.

Answer 6

1/R_eq=1/R + 1/R + 1/R …..

V_T = V₁ + V₂ + V₃ ……..

I = I₁ + I₂ + I₃ ………

Question 7

What is the power dissipated by resistors?

Answer 7

P = IV = V²/R = I²R

Question 8

The ability to store charge per unit voltage.

Answer 8

This is the capacitance.

Giveben C= V

C’ =Kε₀A/d

Question 9

Describe capacitors in parallel:

Answer 9

In parallel they add by C_eq = C₁ + C₂ + C₃ ……

Question 10

Describe capacitors in series

Answer 10

1/C_eq = 1/C₁ + 1/C₂ 1/C3

Question 11

Describe the energy stored in capcacitors via equation

Answer 11

U = 1/2QV

=1/2CV²

=1/2Q²/C