Final answer:
The classifications of loads when viewed from the source depend on the resistance they present in a circuit diagram, including both Rload and any internal resistance. It is critical to draw a sketch of the circuit, examine the physical principles involved, determine known and unknown quantities, and apply relevant physical laws, such as Ohm's law.
Step-by-step explanation:
When viewed from the source, the classifications of electrical loads can be represented in a schematic sketch like Figure 21.12. The classifications pertain to the resistance (or impedance in AC circuits) that a load presents to the source. It is essential to draw a careful sketch of a circuit with a voltage source and its load, designated Rload. Along with Rload, it's important to consider any internal resistance r of the source, as it is in series with the load and can significantly affect the terminal voltage and current delivered.
In the process of analyzing such a problem, the following steps are usually taken:
- Examine the situation to determine which physical principles are involved and to draw a simple sketch of the circuit.
- Decide which direction is positive and note that on your sketch.
- Identify the physical principles and apply the equations representing those principles.
- Make a list of known and unknown quantities and identify the system of interest, which in this case would be the voltage source and its load.
For instance, if solving for the current through the load, Ohm's law would be applied using the total resistance in the circuit, which includes both Rload and r.