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# OL PH 223 30: 4-5

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## Richard Datwyler

on 29 February 2016

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#### Transcript of OL PH 223 30: 4-5

A 3.0 mm diameter wire carries a 12 A current when the electric field is 0.085 V/m. What is the wire's resistivity?
A 0.50 mm diameter silver wire carries a 20 mA Current. What are the
Electric field
Wire 1 and 2 are made of the same metal. Wire 2 has twice the length and twice the diameter of wire 1. What are the ratios of the resistivity and their resistances ?
Pencil 'lead' is actually carbon. What is the current if a 9.0 V potential difference is applied between the ends of the 0.7 mm diameter, 6.0 cm long lead from a mechanical pencil?
To protect your house you place a 5.0 m tall iron lighting rod. You find that lightning carries 50 kA and lasts up to 50 micro seconds
How much charge is that?
What is the effective resistance?
Individually....
If a 9 V battery was inserted between a and b, how much power would all the resistors dissipate?
This one?
=
and Electron drift speed in the wire?
=
1:1
If you don't want the potential difference between top and bottom to exceed 100 V what must the diameter be?
2000
10
4
8
12
4
12
4
8
4
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