Wattage/Impedance Table
Use this guide to help determine impedance loads when designing layouts. This guide also shows how to substitute 25 and 70.7V equipment.
Impedance
(Ohms) |
25V line
(Watts) |
70.7V line
(Watts) |
50V Line*
(Watts) |
l00V Line*
(Watts) |
| 31 |
20 |
160 |
80 |
320 |
| 39 |
16 |
128 |
64 |
256 |
| 42 |
15 |
120 |
60 |
240 |
| 62 |
10 |
80 |
40 |
160 |
| 78 |
8 |
64 |
32 |
128 |
| 83 |
7.5 |
60 |
30 |
120 |
| 125 |
5 |
40 |
20 |
80 |
| 156 |
4 |
32 |
16 |
64 |
| 169 |
3.7 |
30 |
15 |
60 |
| 250 |
2.5 |
20 |
10 |
40 |
| 312 |
2 |
16 |
8 |
32 |
| 333 |
1.8 |
15 |
7.5 |
30 |
| 500 |
1.25 |
10 |
5 |
20 |
| 625 |
1 |
8 |
4 |
16 |
| 666 |
.94 |
7.5 |
3.7 |
15 |
| 1000 |
.625 |
5 |
2.5 |
10 |
| 1250 |
.5 |
4 |
2 |
8 |
| 1330 |
.48 |
3.84 |
1.92 |
7.68 |
| 2000 |
.31 |
2.5 |
1.25 |
5 |
| 2500 |
.25 |
2 |
1 |
4 |
| 2780 |
.225 |
1.8 |
.9 |
3.6 |
| 4000 |
.156 |
1.25 |
.625 |
2.5 |
| 5000 |
.125 |
1 |
.5 |
2 |
| 5550 |
.112 |
.9 |
.45 |
1.8 |
| 7690 |
.081 |
.65 |
.325 |
1.3 |
| 10,000 |
.062 |
.5 |
.25 |
1 |
| 10,410 |
.060 |
.48 |
.24 |
.96 |
| 20,000 |
.031 |
.25 |
.125 |
.5 |
| 40,000 |
.015 |
.125 |
.062 |
.25 |
| 80,000 |
.008 |
.062 |
.032 |
.125 |
*Typically used overseas