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notes5 2317

# notes5 2317 - 29 29 12 AB V A B = Φ Φ =-100 Ω 12 V...

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Prof. David R. Jackson ECE Dept. Spring 2011 Notes 5 ECE 2317 ECE 2317 Applied Electricity and Magnetism Applied Electricity and Magnetism Notes prepared by the EM Group University of Houston

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Grounding Grounding Grounding: connecting a conductor to the physical earth Safety reasons Noise reasons equipment water pipe
Grounding (cont.) Grounding (cont.) Ensures that there is no voltage drop between equipment and ground Ensures that the is no electric field outside of equipment Ensures that there is no charge build up on equipment equipment water pipe + - V AB = 0

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Grounding (cont.) Grounding (cont.) equipment ground Ground symbol: Note: Grounding is NOT is the same thing as a reference point. (However, when a circuit is grounded, the ground is OFTEN chosen to be a reference point of zero volts.)
Example Example reference point (choose 0 [ V ]) ( 29 ( 29 12 AB V A B = Φ - Φ = + - 100 12 [ V ] ground A B ( 29 0 12 B - Φ = 12 [V] B Φ = - Note: In most practical voltage sources, it is the negative terminal that is grounded.

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Example (cont.) Example (cont.) This is the most common scenario.

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Unformatted text preview: ( 29 ( 29 12 AB V A B = Φ- Φ = +-100 Ω 12 [ V ] ground A B ( 29 0 12 A Φ- = 12[V] A Φ = + reference point (choose [V]) Grounding (cont.) Grounding (cont.) ground hot neutral (grounded back at junction box) Grounding (cont.) Grounding (cont.) ground hot neutral +-V I The neutral wire is grounded back at the junction box. junction box Note: The voltage of the neutral wire at the device is not exactly the same as ground, because the neutral wire has a resistance. wall Ground Protection Ground Protection ground hot neutral The metal casing is normally connected to ground. metal casing GFCI (Ground Fault Circuit Interrupter) GFCI (Ground Fault Circuit Interrupter) hot neutral I h I n I g = I h- I n GFCI Circuit trips when I g > 5 [ mA ] In normal operation, I g = 0 . Double Insulated Tool Double Insulated Tool hot neutral I h I n The device is surrounded by an insulating plastic case. It does not require a ground. plastic case...
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