By Thomas Kubala

Designed to offer readers the "building blocks" of electrical energy strategies, the series of issues and useful functions during this ebook will offer a high-quality beginning in electron idea and stream, direct-current sequence circuits, parallel circuits, series-parallel circuits, voltage line drops, rotating equipment basics, and extra! electrical energy 1: units, Circuits and fabrics, ninth version follows a similar hassle-free technique that made earlier versions so powerful, whereas incorporating updates in response to the 2008 nationwide electric Code. that includes present terminology, photos of customary electric gear, and pattern issues of strategies, this is often a terrific selection for a primary path in uncomplicated electrical energy, condominium wiring, or advertisement installations.

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Additional resources for Electricity 1: Devices, Circuits and Materials, Ninth Edition

Example text

A battery can also be tested with a high-current discharge tester. This is simply an ammeter combined with a load circuit. A high reading indicates a fully charged battery, and a low reading indicates a need for charging. The ammeter in this instrument is usually calibrated in terms of the state of charge. BATTERY CHARGING A battery used for emergency power should be charged once a month or whenever its specific gravity falls to 1,150. Low specific gravity readings result from normal discharge or because the battery has been allowed to remain inactive.

2 2 30 1 1 10 E = 128 V 9. Find ET in Figure 3-12. Figure 3-12 Finding total voltage. 1 8 2 E 6 I = 3A R3 12 10. If E2 = 54 volts, find E1 in Figure 3-13. Figure 3-13 Finding voltage. 2 R2 9 1 R1 R3 3 ET Unit 3 Series Circuits 11. Using the circuit in problem 10, find E2 if E1 = 6 V. 12. Find E1 and E3 in Figure 3-14. R2 I E1 = 4A R2 R1 R3 2 5 E3 ET Figure 3-14 Finding voltages. 13. For the circuit in problem 12, find ET if R2 = 4 Ω. 14. For the circuit in problem 12, if IR changes to 6A and R2 is unknown, find E3.

In engine-driven vehicles, batteries are charged by an alternator that is mounted in the vehicle. When a high-voltage DC supply is available, batteries may be charged directly from the source by using suitable current-limiting circuitry. When an AC supply is used, the voltage must be rectified, that is, changed to DC before being applied to the battery.

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