Lesson 9: Circuitry and Electromagnetism
Understanding Circuitry and Electromagnetism
Electric circuits consist of components like resistors, capacitors, and inductors connected by conductive paths. Electromagnetism is the interaction between electric currents and magnetic fields.
Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them: V = IR.
Example Problems
Example problem:
Calculate the current flowing through a circuit with a voltage of 12 V and a resistance of 4 ohms.
Solution:
Ohm's Law: V = IR
I = V / R
I = 12 V / 4 ohms
I = 3 A
Another example:
A 10 ohm resistor is connected to a 5 V battery. What is the power dissipated by the resistor?
Solution:
Power = Voltage * Current
= Voltage² / Resistance
= (5 V)² / 10 ohms
= 25 / 10
= 2.5 W