Circuit kolla Blog

 The Switch Figure 1 : The push-button is a popular switch The switch is a component that connects one pin to another. For current to flow through a circuit, there needs to be a path from the plus of the battery to the minus of the battery. If you build a simple circuit with an LED and a resistor and connect this to a battery, your LED will light up. If you disconnect the plus of the battery from the circuit, the LED turns off.  The switch is nothing more than a way to connect and disconnect two or more things. For example to make a light-switch. Or a keyboard. Figure 2 : The switch symbol comes in many forms. This is the push button switch. Example   In Figure 3, you can see how you can use a switch to turn on and off an LED. Figure 3 : In this circuit, the switch turns on the LED when pushed down  

 The Resistor Figur1 : The resistor in a circuit I didn’t understand the resistor in the beginning. It seemed like it didn’t do anything! It was just there, consuming power. But eventually, I learned that the resistor is extremely useful. You’ll see resistors everywhere. And as the name suggests, they resist the current. But you are probably wondering: “What do I use it for?” You use the resistor to control the voltages and the currents in your circuit. Figure 2 : You always need a resistor with the LED Let’s say you have a 9V battery and you want to turn on an LED. If you connect the battery directly to the LED, LOTS of currents will flow through the LED! Much more than the LED can handle. So the LED will become very hot and burn out after a short amount of time. But – if you put a resistor in series with the LED, you can control how much current is going through the LED. Figure 3 : A rectangle or a zigzag line is used as a symbol for the resistor   Example In Figure 4 you ca...