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# Glossary

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• ### A

• Active Power
The amount of power actually doing useful work. Actual power is also referred to as actual power or real power2.
• Actual Power
The amount of power actually doing useful work. Actual power is also referred to as active power or real power.
• ### B

• Battery Capacity
Batteries are rated by their manufacturers to put out a certain number of amperes for six hours before reaching a voltage of 1.70 volts per cell. If, for example, a battery is rated to put out 100 amperes for six hours, then its capacity rating is 6 hours x 100 amps = 600 ampere hours. If discharged faster, it will provide fewer ampere hours; if slower, it will produce more.
• Battery Voltage
The nominal open circuit battery voltage is 2 volts per cell. Measured more precisely, it varies in relation to the battery's state of charge. A fully charged battery (for most designs) will be 2.13 volts per cell, while a deeply discharged battery many go as low as 1.95 volts per cell. On charge, end of charge readings of 2.60-2.70 are normal. On charge readings must be temperature compensated by adding 0.010 volts per cell for every 3°F above 77°F and subtracting the same amount if below.
• ### G

• Gauge Length
Unit of length which is used to calculate strain, the original sample length, height or grip separation.
• Gauge Length
Unit of length which is used to calculate strain, the original sample length, height or grip separation.
• Gauge Length
Unit of length which is used to calculate strain, the original sample length, height or grip separation.
• Gauge Length
Unit of length which is used to calculate strain, the original sample length, height or grip separation.
• Gauge Length
Unit of length which is used to calculate strain, the original sample length, height or grip separation.
• ### I

• Impact
The striking of one body against another.
• ### K

• Knot Strength
Measurement of the degradation of a material when a knot is formed due to compressive and tensile forces.
• ### N

• Necking
Reduction of the cross sectional area of the metal in a portion of the sample caused by stretching.
• ### O

• Offset Yield
Point of interception on the stress / strain curve, parallel to the line of best fit offset by a defined extension.
• ### P

• Peel Resistance
Another name for bond strength.
• ### R

• Rate of Creeping
Timed rate of deformation when the sample is subjected to a constant load at a constant temperature.
• ### S

• Seam
Joint consisting of a line formed by joining two pieces.
• ### T

• Tack Test
Applicable to adhesives. Two surfaces are contacted together at a set speed for a set duration and the force required to pull them apart is recorded.
• ### V

• Voltage
Electrical pressure; force that causes current in an electrical conductor.