# What is the output voltage of the rr unit

## Measurement of current, voltage, power and work

Electrical Metrology pp 127-206 | Cite as

• K. H. Winterling
• D. Selle

### Summary

The electrical units for current (amperes) and voltage (volts) are chosen so that the unit for electrical energy is identical to the energy unit of the mechanics
\$\$ {\ text {1V}} \ cdot {\ text {1A}} \ cdot {\ text {1s = 1Ws = 1J = 1kg}} \, {\ text {m}} ^ 2 {\ text {s} } ^ {- 2} = 1 \, {\ text {Nm}} \$\$
The ratio of the unit of voltage to the unit of current, the unit of electrical resistance, is determined by
\$\$ 1 \ Omega = \ frac {{{\ text {1V}}}} {{{\ text {1A}}}} \ equiv \ frac {{10 ^ 7}} {{4 \ pi}} \ mu _0 \ frac {{\ text {m}}} {{\ text {s}}} {\ text {or}} \ mu _0 \ equiv 4 \ pi \ cdot 10 ^ {- 7} \ Omega {\ text {sm }} ^ {- 1} \$\$
With μ0 as an induction constant. The SI units, which have been in effect internationally since 1960 and were introduced in the Federal Republic of Germany on July 2, 1969, form a coherent system with the mechanical basic units kg, m, s and the electrical unit A. In coherent systems, composite units are formed by products of integer powers of the basic units without number factors (unit equations).
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