Clive W. Humphris

**OHM'S LAW: Current. **

A simple DC circuit consists of a current source (the battery) connected across a resistor. Electrons are propelled by the electromotive force (voltage) of the battery. Expelled from the negative terminal (-) and attracted by the positive (+) terminal.

Using Ohm's Law the circuit voltage, current or resistance can be found. An easy way of remembering each of the formulae is to draw a triangle as shown. Covering the result variable in the triangle leaves the required formula.

The graph shows a linear relationship between V, I and R, i.e. an increase in the voltage across the resistor causes a proportional increase in the current through the resistor.

The plot Window shows an accurate representation for your chosen values.

- Table of Contents
- Interactive eTextbooks
- Basic Electronics
- Conductor And Insulator
- Resistor Value Test
- Simple Dc Circuits
- Types Of Switching
- Variable Voltages
- Ohm's Law
- DC Voltage
- DC Current
- Series and Parallel Resistors
- AC Measurement
- AC Voltage and Current
- AC Theory
- RCL Series
- RCL Parallel
- Capacitance
- Capacitors
- Inductance
- Inductors
- Impedance
- Radio and Communication
- Tuned Circuits
- Attenuators
- Passive Filters
- Active Filters
- Oscillators
- Circuit Theorems
- Complex Numbers
- DC Power
- AC Power
- Silicon Controlled Rectifier
- Power Supply
- Voltage Regulation
- Electro-Magnetism
- Electrical Machines
- Transformers
- Three Phase Systems
- Energy Transfer and Cost
- Atomic Structures
- Diode Theory
- Diode Applications
- Transistor Theory
- Bipolar Transistors
- Transistor Configurations
- Active Transistor Circuits
- Field Effect Transistors
- Basic Operational Amplifier
- Op-Amp Theory
- Op-Amp Applications
- Sum and Difference Amplifiers
- Analogue Multi-Meter
- Component Testing