Resistance is measured in ohms, and the symbol for an ohm is Ω (omega).
Two types of particles are found within the nucleus: protons and neutrons. Protons have a positive charge, and neutrons are neutrally charged.
Alternating current (AC) is when the electric current reverses direction many times in a second.
This symbol represents a short circuit, which is an accidental path of low resistance that passes an irregularly high amount of current.
I represents current. Current is the rate of flow of electrons, or the Intensity of the flow. (Specifically, I is the rate of charge flow.)
The P-type material in a diode is the anode, and the N-type material is known as the cathode.
Pure silicon must be doped in order to generate holes or free electrons. This process creates the P and N materials needed to make diodes and transistors.
Capacitors stop direct current flow but not alternating current. The higher the frequency of an alternating current, the less resistant effect a capacitor has. Standard resistors, both fixed and variable, definitely resist AC flow, as do inductors.
When wired in series, the resistance of several loads can be added together to determine the effective resistance. The sum of the four resistances is 20 Ω.
The arrow in a transistor symbol is always placed on the emitter, and the arrow always points toward the N-type material at that junction.
This is the circuit symbol for a voltmeter, which is used to measure voltage.
There are three essential components of an electrical circuit: a voltage source, a load, and conductors to connect the load to the voltage source. When these three components are connected so that current can flow, it is a closed circuit.
A doorbell is typically operated by a push switch, which allows current to flow only when a button is pressed. (A) is the symbol for a push switch.
This is the schematic symbol for an alternating current (AC) voltage source.
Capacitors that are electrical storage units are also known as condensers.
An insulator is a material that does not conduct electricity.
Rubber is an example of an insulator. All of the other examples in this question are conductors.
Four 6-ohm resistors wired in series will have a total resistance of 24 ohms. Using I = V ÷ R, a total of 0.5 A will flow in this circuit. 0.5 A is the same as 500 mA.
The term semiconductor refers to an element that has four electrons in its valence shell. Since the bonds between these four electrons and the nucleus are somewhat strong, these elements are neither good conductors nor good insulators. One element that is widely recognized as a semiconductor is silicon.
This is the circuit symbol for a galvanometer, which is used to measure extremely small currents, usually of 1 mA voltage or less.