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Turn off the power!

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Q: What must you always do before taking apart a circuit?
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Why is a torch switch important in a circuit?

A switch in a circuit will quickly allow you to break the circuit, without changing the wiring. For example, a light switch. By turning a light switch off, you are breaking the circuit and, thus, turning the light off.


What would happen if you tried to operate a dc permanent magnet motor from an ac supply?

Apart from a lot of loud humming, the motor would not turn, it would take a lot of current and, if the circuit breaker did not trip to cut the supply of current, it would probably overheat or might even catch on fire.


A diagram of a schematic drawing of a parallel circuit?

- Mark two points on your paper, a few inches apart. - Draw the symbol for a battery or power supply that is connected to the two points. - Draw the symbol for an electronic component, such as a capacitor, resistor, light bulb, photocell, thyristor, thermistor etc., that is connected to the same two points. - Draw the symbol for ANOTHER electronic component that is also connected to the same two points. - Now you have the diagram of a circuit with a power supply and two components all in parallel.


Why are fixtures terminated in a junction box?

Splices and termination are made in junction boxes because of safety. The weakest part of any circuit is the place where two or more wires are joined together. Because most home splices are of a mechanical nature they an become loose or just fall apart. A loose connection in a circuit that is carrying a high current will create heat through the resistance formed by the loose connection. Heat can cause combustion. Be retaining the heat or combustion in a closed container such as a junction box it contains the fault to a local area. Some electrical faults can create a shower of sparks that if not contained could cause the surrounding materials to ignite. Always keep the overs on junction boxes and never get into the habit of making open wire splices just because they work. Safety first.


How can I find a short in my wiring that keeps popping the breaker?

The first thing to do would be to unplug everything that might be plugged into that circuit. It might be an external device that is tripping the breaker. If you know an electrician see if he will help you as thing can get complicated with this type of troubleshooting.Usually the wiring in the wall does not fault unless someone has driven a screw or nail into it. The fault will be in the junction box so look for burn marks inside the junction boxes. It could be as simple as a ground wire touching the "hot" terminal of a switch or plug that has just be changed out for a new one. If there was some DIY work done on that circuit, check that part of the circuit out first.The very first thing to do is to turn the breaker off, remove the electrical circuit from the breaker that is tripping and then turn the breaker back on to determine that it is not a faulty breaker. With the circuit wire removed from the breaker, the breaker should not trip. If it does change the breaker out for a new one.The second part of trouble shooting the circuit is going to entail turning the breaker on and off with exposed wiring open at junction boxes. If you are not confident that you can do this, hire an electrician. Trouble shooting this type of electrical fault is time consuming. I like to determine where the middle of the circuit is and open that junction box first. This will let you know if the fault is upstream or downstream from this junction box.Once you determine approximately where the middle junction box of the circuit is, it has to be opened and the wires removed from the device that is located in the box. Make a detailed diagram of how the device is wired into the circuit and what wires are spliced together in the back of the box that you are working on so that the box can be reconnected the same as before you took it apart. Once the wires are all seperated from each other, turn the breaker on and see if the breaker trips off.If it does not then the fault is downstream from this box. Put the wiring back together the same as it was and move on to the next box downstream and do the same procedureon that junction box. If the breaker trips then the wiring has a fault between the breaker and the box you chose to open the circuit at. Again put the wiring back together the same as it was and move on to the next box upstream and do the same procedure on that junction box. Continue with this same type of procedure until you find out what junction box connection is tripping the breaker.