![]() ![]() High current demands require electrical leads and switches capable of staying cool and collected when serious amounts of current are flowing. Motors, fans, pumps, horns and non-LED lighting have high current demands. Text by Michael Ferrara // Photos by Jun Chen However, understanding the importance of the current demands of different systems on a vehicle is key to designing and improving a vehicle’s electrical system. Now don’t worry, your body’s natural electrical resistance is high enough to limit current flow from a vehicle’s 12-volt electrical system. This may actually protect the heart from fibrillation and increase the victim’s chances of survival. At 200 milliamps, the human heart can forcibly clamp itself during the electrical shock. This spastic twitching of the heart’s ventricle walls can result in death. At 100 milliamps, ventricular fibrillation of the heart occurs. ![]() At 20 milliamps, breathing can become labored, while 75 milliamps can cause breathing to cease. Currents above 10 milliamps can induce muscle contractions so strong that the victim cannot let go of the wire that’s shocking them. When you apply a voltage to the coil the Light will be turned OFF.It’s the current that kills you. Similarly, if you connected the light in NC Terminal, by default the light will be in ON State. If the power to the coil is removed the Light will be turned OFF. Only if we give power supply to the Coils of Relay, the relay will latch it terminal towards ‘Normally Open’ terminal and then the Power Supply flows through it. So, in an idle state, the light won’t be turned ON. We have connected the neutral terminal of light to ‘ Normally Open‘ Terminal of the Relay. To turn ON the Light, we need Phase and Neutral to its terminals. The phase wire is directly connected to the light. A Neutral wire from the power socket is connected via relay to the light’s neutral terminal. The output side of the terminals only shown here (NO, COM, NC). We will be connecting High power devices like AC Light, Fan, DC Motor, etc.Ī Simple example of connecting an AC Light with Relay is shown below. In a 5V Relay, you need to supply 5V to the coil terminals that will energize the coil.Īt the output terminal COM, NO, NC. ![]() The Coil T1 and Coil T2 are input terminals for the relay.
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