By Stephen Herman

Full of real-world examples, shiny illustrations, and the most recent advancements from the sphere, electric reports FOR TRADES, fifth variation is perfect for present and destiny carrier technicians in air-con and refrigeration, building, and amenities management--and an individual else who wishes a realistic wisdom of electrical energy. super reader-friendly, the booklet starts with an summary of uncomplicated electrical energy concepts--rather than complicated mathematical calculations. From the following, you continue on to "must-know" info, together with how one can make sure twine sizes and make a number of universal swap connections. forms of electricity panels also are tested intimately. dialogue of normal wiring practices and circuit protectors, in addition to an creation to transformers and three-phase and single-phase cars, around out the great insurance.

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**Sample text**

EIR I E R R E I E 5 EMF, or voltage I 5 intensity of current, or amperage R 5 resistance The first formula states that the voltage can be found if the current and resistance are known. Voltage is equal to amps multiplied by ohms. For example, assume a circuit has a resistance of 50 and a current flow through it of 2 A. The voltage connected to this circuit is 100 V. Ohm’s Law law to measure electrical resistance. KeY POiNt ■ ■ ■ ■ ■ it takes one volt to push one amp through one ohm. ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ KeY POiNt ■ ■ ■ ■ ■ in a DC circuit, the current is directly proportional to the voltage and inversely proportional to the resistance.

The first two bands represent the numbers 1 and 5 (brown is 1 and green is 5). The third band is red, which has a number value of 2. The number 15 should be multiplied by 102, or 100. The value of the resistor is 1,500 . Another method, which is simpler to understand, is to add the number of zeroes indicated by the multiplier band to the combined first two numbers. The multiplier band in this example is red, which has a numeric value of 2. Add two zeroes to the first two numbers. The number 15 becomes 1,500.

In this circuit, the ungrounded or hot conductor is connected to the fuse or circuit breaker. The hot conductor grounding conductor the conductor used to ground a piece of equipment. Copyright 2013 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. 28 Unit 2 Ba tte ry Current flows through a closed circuit. Ba tte No current can flow through an open circuit. Figure 2-8 Current flows only through a closed circuit. © Cengage Learning 2014 ry Point of short circuit Ba ry © Cengage Learning 2014 tte Figure 2-9 A short circuit bypasses the load and permits too much current to flow.

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