Slide 1 : Ohm's Law
Ohm’s Law : What is Ohm's Law?
Ohms Law is a mathematical equation explaining the relationship between Voltage, Current, and Resistance within electrical circuits. It is defined as follows:
E = I x R; R = E/I; I = E/R
E = Voltage (Voltage is an electric potential difference between two points on a conducting wire. Voltage is measured in volts and comes from various sources such as electric outlets and batteries.)
I = Current (Current is measured in amperes. Current is the flow of charged particles caused by a difference in potential (voltage).)
R = Resistance (Resistance is the opposition that a material body offers to the passage of an electric current. Resistance is measured in ohms. Examples of items with resistance are: light bulbs, heating elements, hot plates, toasters.) Ohm’s Law
Graph with Linear Curve : Graph with Linear Curve E, volts I, current in mA
Curve Fitting : Curve Fitting E, volts See pages 10-13 of Lesson Plan 7: “Ohm’s Law” for discussion of non-linear equations and effects of light bulb. I, current in mA
Slide 5 :
Simple Test Circuit : Simple Test Circuit See page 18 of Lesson Plan 7 “Ohm’s Law.
Simple Test Setup : Simple Test Setup THE FIRST DATA POINT IS TAKEN AS SHOWN IN SOLID LINES. FOR DATA POINTS 1, 2, 3 AND 4, MOVE THE JUMPER LEAD AS SHOWN IN DOTTED LINES See page 19 of Lesson Plan 7 “Ohm’s Law.
Test Circuit Bulb Setup : Test Circuit Bulb Setup See page 24 of Lesson Plan 7: “Ohm’s Law”
Test Circuit Resistor Setup : Test Circuit Resistor Setup See page 27 of Lesson Plan 7: “Ohm’s Law”
Battery Voltage Pick-offs : Battery Voltage Pick-offs See page 25 of Lesson Plan 7: “Ohm’s Law” Note: Fig 2B is incorrect … bypass for cells 1 and 2 is shown. Fig 2A should say “bypass” instead of jumper for consistency.