femtowatt | 1 fW | 2 fW | 3 fW | 4 fW | 5 fW | 6 fW | 7 fW | 8 fW | 9 fW | 10 fW | 11 fW | 12 fW | 13 fW | 14 fW | 15 fW | 16 fW | 17 fW | 18 fW | 19 fW | 20 fW | 21 fW | 22 fW | 23 fW | 24 fW | 25 fW | 26 fW | 27 fW | 28 fW | 29 fW | 30 fW | 31 fW | 32 fW | 33 fW | 34 fW | 35 fW | 36 fW | 37 fW | 38 fW | 39 fW | 40 fW | 41 fW | 42 fW | 43 fW | 44 fW | 45 fW | 46 fW | 47 fW | 48 fW | 49 fW | 50 fW | 51 fW | 52 fW | 53 fW | 54 fW | 55 fW | 56 fW | 57 fW | 58 fW | 59 fW | 60 fW | 61 fW | 62 fW | 63 fW | 64 fW | 65 fW | 66 fW | 67 fW | 68 fW | 69 fW | 70 fW | 71 fW | 72 fW | 73 fW | 74 fW | 75 fW | 76 fW | 77 fW | 78 fW | 79 fW | 80 fW | 81 fW | 82 fW | 83 fW | 84 fW | 85 fW | 86 fW | 87 fW | 88 fW | 89 fW | 90 fW | 91 fW | 92 fW | 93 fW | 94 fW | 95 fW | 96 fW | 97 fW | 98 fW | 99 fW | 100 fW |
microwatt | 1.0 × 10-9 µW | 2.0 × 10-9 µW | 3.0 × 10-9 µW | 4.0 × 10-9 µW | 5.0 × 10-9 µW | 6.0 × 10-9 µW | 7.0 × 10-9 µW | 8.0 × 10-9 µW | 9.0 × 10-9 µW | 1.0 × 10-8 µW | 1.1 × 10-8 µW | 1.2 × 10-8 µW | 1.3 × 10-8 µW | 1.4 × 10-8 µW | 1.5 × 10-8 µW | 1.6 × 10-8 µW | 1.7 × 10-8 µW | 1.8 × 10-8 µW | 1.9 × 10-8 µW | 2.0 × 10-8 µW | 2.1 × 10-8 µW | 2.2 × 10-8 µW | 2.3 × 10-8 µW | 2.4 × 10-8 µW | 2.5 × 10-8 µW | 2.6 × 10-8 µW | 2.7 × 10-8 µW | 2.8 × 10-8 µW | 2.9 × 10-8 µW | 3.0 × 10-8 µW | 3.1 × 10-8 µW | 3.2 × 10-8 µW | 3.3 × 10-8 µW | 3.4 × 10-8 µW | 3.5 × 10-8 µW | 3.6 × 10-8 µW | 3.7 × 10-8 µW | 3.8 × 10-8 µW | 3.9 × 10-8 µW | 4.0 × 10-8 µW | 4.1 × 10-8 µW | 4.2 × 10-8 µW | 4.3 × 10-8 µW | 4.4 × 10-8 µW | 4.5 × 10-8 µW | 4.6 × 10-8 µW | 4.7 × 10-8 µW | 4.8 × 10-8 µW | 4.9 × 10-8 µW | 5.0 × 10-8 µW | 5.1 × 10-8 µW | 5.2 × 10-8 µW | 5.3 × 10-8 µW | 5.4 × 10-8 µW | 5.5 × 10-8 µW | 5.6 × 10-8 µW | 5.7 × 10-8 µW | 5.8 × 10-8 µW | 5.9 × 10-8 µW | 6.0 × 10-8 µW | 6.1 × 10-8 µW | 6.2 × 10-8 µW | 6.3 × 10-8 µW | 6.4 × 10-8 µW | 6.5 × 10-8 µW | 6.6 × 10-8 µW | 6.7 × 10-8 µW | 6.8 × 10-8 µW | 6.9 × 10-8 µW | 7.0 × 10-8 µW | 7.1 × 10-8 µW | 7.2 × 10-8 µW | 7.3 × 10-8 µW | 7.4 × 10-8 µW | 7.5 × 10-8 µW | 7.6 × 10-8 µW | 7.7 × 10-8 µW | 7.8 × 10-8 µW | 7.9 × 10-8 µW | 8.0 × 10-8 µW | 8.1 × 10-8 µW | 8.2 × 10-8 µW | 8.3 × 10-8 µW | 8.4 × 10-8 µW | 8.5 × 10-8 µW | 8.6 × 10-8 µW | 8.7 × 10-8 µW | 8.8 × 10-8 µW | 8.9 × 10-8 µW | 9.0 × 10-8 µW | 9.1 × 10-8 µW | 9.2 × 10-8 µW | 9.3 × 10-8 µW | 9.4 × 10-8 µW | 9.5 × 10-8 µW | 9.6 × 10-8 µW | 9.7 × 10-8 µW | 9.8 × 10-8 µW | 9.9 × 10-8 µW | 1.0 × 10-7 µW |
The femtowatt (fW) is equal to one quadrillionth (10−15) of a watt. Technologically important powers that are measured in femtowatts are typically found in reference(s) to radio and radar receivers. For example, meaningful FM tuner performance figures for sensitivity, quieting and signal-to-noise require that the RF energy applied to the antenna input be specified. These input levels are often stated in dBf (decibels referenced to 1 femtowatt). This is 0.2739 microvolt across a 75-ohm load or 0.5477 microvolt across a 300-ohm load; the specification takes into account the RF input impedance of the tuner.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
femtowatt | fW | = 10-15 W | = 10-15 W | Metric system SI |
femtowatts | microwatts | femtowatts | microwatts |
---|---|---|---|
1 | = 1.0E-9 | 6 | = 6.0E-9 |
2 | = 2.0E-9 | 7 | = 7.0E-9 |
3 | = 3.0E-9 | 8 | = 8.0E-9 |
4 | = 4.0E-9 | 9 | = 9.0E-9 |
5 | = 5.0E-9 | 10 | = 1.0E-8 |
The microwatt (µW) is equal to one millionth (10−6) of a watt. Important powers that are measured in microwatts are typically stated in medical instrumentation systems such as the EEG and the ECG, in a wide variety of scientific and engineering instruments and also in reference to radio and radar receivers. Compact solar cells for devices such as calculators and watches are typically measured in microwatts.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
microwatt | µW | = 10-6 W | = 10-6 W | Metric system SI |
microwatts | femtowatts | microwatts | femtowatts |
---|---|---|---|
1 | = 1000000000 | 6 | = 6000000000 |
2 | = 2000000000 | 7 | = 7000000000 |
3 | = 3000000000 | 8 | = 8000000000 |
4 | = 4000000000 | 9 | = 9000000000 |
5 | = 5000000000 | 10 | = 10000000000 |
femtowatts | microwatts |
---|---|
1 | = 1.0 × 10-9 |
1 000 000 000 | = 1 |
Symbol | Definition |
---|---|
≡ | exactly equal |
≈ | approximately equal to |
= | equal to |
digits | indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …) |