Page 53 - 05. Subyek Teknik Mesin - Automobile Mechanical and Electrical Systems Automotive Technology Vehicle Maintenance and Repair (Vehicle Maintenance Repr Nv2) by Tom Denton

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38 Automobile mechanical and electrical systems

Table 1.17 SI units

Unit Abbreviation Quantity Example
metre m Length The distance from one point to
another

kilogram kg Mass The quantity of matter which
makes an object
second s Time About 300 s to boil an egg!

ampere A Electric current The fl ow rate of electricity
through a wire
kelvin K Temperature How hot the radiator of a car is
candela cd Luminous intensity How brightly a headlight shines

Table 1.18 Derived SI units
Unit Abbreviation Quantity
Figure 1.51 Mmm!
joule J Energy
newton N Force
watt W Power
2
area m Square metres
3
volume m Cubic metres
torque Nm Newton metres
1
velocity m/s or m s Metres per second
2
acceleration m/s/s or m s Metres per second per second

Table 1.19 Common multipliers
Prefi x Symbol Value Long value
6
mega M 10 1 000 000
3
kilo k 10 1000
2
hecto h 10 100
2
centi c 10 0.01
3
milli m 10 0.001
6
micro μ 10 0.000 001

Likewise, if setting a spark plug gap I could set it at 0.001 metres, or it might be
easier to say 1 millimetre, normally written as 1 mm. The ‘m’ can be thought of as
a divider which in this case is 1000 or a multiplier of 0.001. Common multipliers
are listed in Table 1.19 .