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What are the most common SI units for a ruler?
The basic unit of length (on a ruler) is the meter, symbol m. Two smaller units (decimal fractions of the meter are: centimeter cm (0.01 of the meter) millimeter mm (0.001 of the meter) The meter is slightly larger than a yard. Approximately 39.37 inches. Conversely one inch is 2.54 centimeters exactly. There are several other prefixes the multiply or divide SI units in powers of 10.
What is a digital micrometer used to measure?
The digital micrometer just like the analog micrometer is used to measure thicknesses, diameters, etc. The main difference is that it is easier for the user to read (as is true of most digital vs. analog things).
Is an analog clock more accurate than a digital clock?
Digital clocks will be the most accurate because its computer operated.
What does most common and least common mean?
Most common is the thing that happens most, and least common is the least ocuring thing. For example it is most common to open chess with middle pawn forward. And it is least common to move one of the far pawns first.
What are two parts of kilowatt hour ammeter?
Most important part is the shunt. It diverts most of the current around the meter. They used to be 50 micro amp meter movements. They were 100 microamp movements with a resistor that matched the meters coil resistance and split the meter current. That is they fully deflect when 50 microamps is flowing through the coil of the meter movement. Electronic ones still have a shunt. It is basically a piece of metal used as a resistor. The resistors value determines the amount of current it will pass according to Ohms law. The full range current used in the calculation. "Amps equals voltage divided by resistance". "Resistance equals voltage divided by current". That would give you the full resistance. You calculate the 50 microamps and subtract its resistance and use the remainer as your shunt value. Part 1: Shunt Part 2: Meter That is an ampmeter. A watt meter is a combination of an ampmeter and a voltmeter. Ohms' Law applies strictly. You feed the amps and voltage to the meter movement ( now LCD display) and it "does the math" and displays in watts. Curent in amps is measured is series and volts are measured in parallel with the source. Voltage times amps equals watts. One kilowatt at standard household voltage of 115 volts A.C. is about 9 amps.
