Here's another installer friendly component you should always have handy. Blocking diodes (1N4001/L) are one way valves used in electrical circuits. These are very simple devices that are often real time savers. Other than the amperage rating of the diode, there are only three basic things to remember:
1. Cathode (side with the stripe)
2. Anode (side without the stripe)
3. Anytime the cathode is more positive than the anode, no current will flow.
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