Ever wondered how your phone charges or how lights turn on with a simple switch? Well, all this has to do with electrical circuits! Understanding basic electrical circuits is learning the ABCs of electricity. Let’s get inside this interesting topic and discover what goes on behind the scenes of our gadgets.
What is an Electrical Circuit?
An electrical circuit is a path through which electric current flows. Let’s think of it as the racetrack, where the electric current is the race car going around the track. For a circuit to function, one needs the following:
- Source of Electricity: This is the source of power, be it a battery or a power outlet
- Conductors: These are wires that tie everything together and facilitate the electric current’s travel.
- Load: That is any device, which needs electricity such as a light bulb or a fan.
- Switch: That is the control and it lets turn circuit on or off.
How Does an Electrical Circuit Work?
Let’s think of an electric circuit in terms of a loop. The electric current flows from the power source, through the conductors and to the load, back to the power source. Whenever a switch is closed, the loop is complete and current can flow. Whenever a switch remains open, it breaks the loop and the flow of current stops.
Example: Take an example of a simple circuit of a battery, a light bulb, and a switch. When you flip the switch, current flows from the battery, through the wires to turn on the bulb and returns back to the battery. When you turn off the switch, it shuts off the current flow, and it eventually turns off the light.
Circuits
There exist two major kinds of circuits-series and parallel.
Series Circuits
In a series circuit all components are connected end to end, therefore making the path followed by current a single one.
Advantages
- It is quite easy to design and construct
- Quite easy to understand
Disadvantages
- If any component fails the whole circuit stops functioning
- The more you add more components the weaker will be the current
Christmas lights often use series circuits. When one bulb burns out, the whole string of lights stops functioning.
Parallel Circuits
Components are connected in separate branches, so that there is more than one path for the current to follow in a parallel circuit.
Advantages
- If one component fails, others continue to function
- Each component receives the same voltage
Disadvantages
- More difficult to design and construct
- Needs more wire
Example: The household wiring is mostly of parallel circuits. If one light bulb burns out, the others remain on.
Electrical Building Blocks
Now, to properly understand what the electrical circuit is, you would have to understand the major parts which make it all happen. These are:
- Resistors: They regulate current flow in the circuit so as to prevent damage to other elements.
- Capacitors: They store and release electrical energy
- Inductors: These store their energy in a magnetic field.
- Diodes: These allow only current to flow in one direction
- Transistors: These are simply a switch or an amplifier in a circuit
Ohm’s Law
Perhaps the most fundamental principle applied in electrical engineering is that of Ohm’s Law. According to this law, current flowing through a circuit is directly proportional to voltage, but inversely proportional to resistance. This is expressed as follows:
I = V/R
Example: Suppose you have a circuit with a 9V battery and a resistor which has 3 ohms. The flow of current in this circuit would be 3 amps.
Safety First!
Electrical circuits require one to be very careful. Here are some of the precautions that one will have to take when dealing with electricity:
- One should always switch off the power source when working on a circuit.
- Use insulated tools when dealing with electricity to avoid electric shocks.
- Be careful of the voltage levels you are working with.
Conclusion
Understanding basic electrical circuits is one of the essential steps of understanding electricity and electronics. It is quite similar to learning to read before reading novels.
But all this aside, you’ll start diving into even more complex questions and designing your own circuits in the comfort of your home.
After all, every gadget that you make use of daily is based upon these simple principles. So the next time you turn a switch on, you will know what’s going on behind it!
Is it time to brighten up your understanding? Then let’s continue learning and exploring this electrifying world of circuits together!
