Voltage, current, resistance, and power are fundamental electrical terms. Let's discuss basic test instruments for measuring these.
A transformer is an electromagnetic device without any moving parts that allows for changes in voltage, current, and impedance.
Electrical calculations generally fall within two categories: dc circuit analysis and ac circuit analysis.
There are five electrical properties that have to be introduced in circuit theory to help with the analysis. These are resistance, capacitance, inductance, reactance, and impedance.
By strict definition a material can be classified as either a conductor, an insulator, or a semiconductor based on its electrical properties. Before getting into the definition of each of these, a brief introduction to atomic theory is in order.