Measuring Power
Power Rating of Resistors
Manufacturers supply resistors with different power ratings. In the low power resistor range, these ratings are;
0.25 Watt, 0.5 Watt, 1 Watt and 2 Watt.
A resistor must have a power rating high enough to dissipate the heat produced by the current flowing through it ( I2R ).
Some resistor types have the power rating marked on the body. In other cases it is the physical size of the resistor that determines its wattage. Carbon film resistor dimensions are illustrated below. Refer to Figure 4.
Power in a Series Circuit
The power dissipated by any resistor is given by, the voltage across that resistor multiplied by the current flowing through it.
Related posts:
REAL-TIME OPERATING SYSTEMS:INPUT/OUTPUT DEVICE DRIVERS
State Variable Feedback Control Theory:Dynamic Observer
Digital Audio Fundamentals:Audio as Data
HUMAN–MACHINE INTERFACES:INDUSTRIAL APPLICATION EXAMPLES
Cables and Cable Termination:Fixing Devices
Objective tests on alternators.
TRANSFORMER COMPONENTS AND MAINTENANCE:INTERCONNECTION WITH THE GRID
Output Devices part2
Microphone Technology:Wireless Microphones
Audio Principles:Level and Loudness
Multispeed Multiwinding Motor
PC Hardware Interfaces: A Developer's Reference - Serial Buses—USB and FireWire
Electronics Explained – Radio/Wireless
Three-phase Distribution Boards And Socket Circuits:Three-phase Supplies