Circuits

Question 1

What is Ohm’s Law?

Answer 1

V=IR

Where V is voltage, I is current, and R is resistance

Question 2

What happens to voltage as current passes through resistors?

Answer 2

There is a decrease in total voltage as current passes through resistors.

Question 3

Resistors in series

Answer 3

RT=R1+R2+R3…

Question 4

Resistors in parallel

Answer 4

1/RT=1/R1+1/R2+1/R3…

Question 5

Resistivity

Answer 5

Measures how strong a resistor is

R=pL/A where p is resistivity in n*m, l is length, and A is area

Smaller area-greater resistance
Greater length-greater resistance

Question 6

Capacitance

Answer 6

Store of electrical potential energy

C=Q/V where C is capacitance, Q is charge, and V is voltage

C is also dependent on area. C=£ A/d

Where £ is a constant, A=area, and d=distance

Question 7

How do we find the electrical potential energy of a capacitor

Answer 7

Ec=1/2CV^2
Ec=1/2QV

Where V is the voltage across the capacitor not the voltage of the battery

Question 8

Capacitors in series

Answer 8

Voltage of capacitors in series have to add up to the voltage of the battery

1/Ct=1/C1+1/C2+1/C3…

Question 9

Capacitors in parallel

Answer 9

Each Capacitor in parallel experiences the same voltage as the battery. However, charges are split up between them. A more powerful Capacitor receives more charge.

Ct=C1+C2+C3…

Question 10

How do dielectrics increase capacitance?

Answer 10

Dielectrics are non conducting materials denoted by constant (k) where k is always >1

They increase capacitance by either increasing the charge or lowering the voltage. Remember C=Q/V

Increase in C= (k)C