PHY103: Introduction to Electric Current and Ohm's Law

International System of Units

• The International System of Units (SI) is commonly used in physics.

Fundamental Theories of Applied Physics

• The two fundamental theories of applied physics related to electric circuits are Kirchhoff's Laws and Thevenin's Theorem.

Electric Circuits

• An electric circuit consists of resistors, capacitors, inductors, and power sources, interconnected by wires.

Electrical Elements

• The interconnection of electrical elements is known as a network.

Ohm's Law

• Ohm's Law relates the voltage, current, and resistance in an electric circuit.

Units of Measurement

• The unit meter per second (m/s) is used to measure the speed of electron motion.
• The unit volt (V) is used to measure electric potential.

Charge

• A charge of 4,600 electrons represents 7.4 x 10^-17 C.
• Six million protons represent a charge of 9.6 x 10^-7 C.

Type of Current

• The type of current relevant in the circuits discussed in the course is Direct Current (DC).