1. Electrical Energy Transmission to a Cabin
Created for CVCA Physics By
Dick Heckathorn
16 March 2K + 5

2. The Problem
You have a cabin in the woods to which you want to add electricity.

3. The Problem You have the option to use a:
12-volt battery that can produce a current of 10-amps or
120-volt electric generator which can produce a current of 1-amp

4. The Problem
Each source is connected to the cabin through a cable which has a resistance of 1-ohm
Which would you choose?

5. Power Available 12-volt battery 120-volt generator P = I*V
12-V * 10-A 120-V * 1-A
120 watts 120 watts

6. Voltage Drop Across Wire
12-volt battery 120-volt generator
V = I*R
10-A * 1-Ω 1-A * 1- Ω
10 volts 1 volts

7. Power Loss Across Wire 12-volt battery 120-volt generator P = I2*R
(10-A)2 * 1-Ω (1-A)2 * 1- Ω
100 watts 1 watt

8. Power Available at Cabin
12-volt battery 120-volt generator
Poriginal - Plost
(120 – 100) watts (120-1) watts
20 watts 119 watt

9. That’s All Folks