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Measuring Voltage The following is a list of the MINIMUM safety precautions for using a voltmeter. Always connect voltmeters in parallel. Always start with the highest range of a voltmeter. Deenergize and discharge the circuit completely before connecting or disconnecting the voltmeter.
Always start with the highest range of an ammeter. Deenergize and discharge the circuit completely before you connect or disconnect the ammeter. In dc ammeters, observe the proper circuit polarity to prevent the meter from being damaged. Never use a dc ammeter to measure ac.
Precautions in Handling and Using a Meter
A voltmeter is always connected in parallel with the circuit component you are measuring. (2 leads may be connected at the same point in a circuit, as shown with the voltmeter in the sketch below.) (again, the negative side of the circuit ALWAYS into COM, the positive side into V, voltage, for this measurement).
Excessive dropping is due to increased resistance in a circuit, typically caused by an increased load, or energy used to power electric lights, in the form of extra connections, components, or high-resistance conductors.
Excessive voltage drop in a circuit can cause lights to flicker or burn dimly, heaters to heat poorly, and motors to run hotter than normal and burn out. This condition causes the load to work harder with less voltage pushing the current.
4 Steps to Minimizing Voltage Drops
Arc-fault circuit interrupters (AFCIs) protect against arcing, a phenomenon that occurs at loose electrical connections and causes electricity to jump between metal contacts. These devices anticipate short circuits and shut the power off before it can reach a short circuit condition.
In simpler terms, short circuits happen when hot wire touches a conductive object it’s not supposed to. The result of a short circuit can be appliance damage, electrical shock, or even a fire.
Short-circuited fault is one of the most dangerous and common faults occurring in power system, which includes three-phase short circuit, two-phase short circuit, two-phase grounding short circuit and single-phase grounding short circuit.
Short circuit occurs when naked live and neutral wires touch each other. Thus, the decrease in value of resistance of the circuit raises the current to a significant amount. As a result, the wires become hot and sparks are caused by Joule’s heating effect of current.
A short circuit fault current can, within milliseconds, be thousands of times larger than the normal operating current of the system. Damage from short circuits can be reduced or prevented by employing fuses, circuit breakers, or other overload protection, which disconnect the power in reaction to excessive current.
Sometimes, due to fault in the electrical appliances or damage of the insulating coating around the two wires i.e., neutral and live, the two wires come in contact with each other and large current flows through them causing short circuit. Large amount of heat is produced due to flow of this large current.
Short circuiting occurs when the live wire comes in direct contact with the neutral wire so a zero resistance path is provided to the current. The heavy current then passes through the appliance and wires of the circuit. Concept: Current Electricity.
Answer. A short circuit is simply a low resistance connection between the two conductors supplying electrical power to any circuit. This results in excessive current flow in the power source through the ‘short,’ and may even cause the power source to be destroyed.
A fuse(s) is needed in any electrical system (AC or DC). These protection devices react to the amount of heat being produced by electricity passing through wires and/or components. They are used so as to protect wires and components from the extreme heat produced should there be an electrical overload or short circuit.
A short circuit is simply a low resistance connection between the two conductors supplying electrical power to any circuit. This results in excessive current flow in the power source through the ‘short,’ and may even cause the power source to be destroyed.
10 Tips for Identifying and Fixing an Electrical Short