SATHEE: Gk Si Units And Measurements

Gk Si Units And Measurements

Quantity	Unit	Symbol	Memory Aid
Length	metre	m	Measure Mile→metre
Mass	kilogram	kg	Keep Goods
Time	second	s	Stop-Watch
Electric current	ampere	A	Ampere → Alternating
Temperature	kelvin	K	King Kelvin
Amount of substance	mole	mol	Molecules
Luminous intensity	candela	cd	Candle Diya

Quantity	Unit	Symbol	In Base Units
Force	newton	N	kg·m·s⁻²
Energy	joule	J	kg·m²·s⁻²
Power	watt	W	kg·m²·s⁻³
Pressure	pascal	Pa	kg·m⁻¹·s⁻²
Frequency	hertz	Hz	s⁻¹
Charge	coulomb	C	A·s

Prefix	Symbol	Power	Example
giga	G	10⁹	1 GW = 10⁹ W
mega	M	10⁶	1 MHz = 10⁶ Hz
kilo	k	10³	1 km = 1000 m
centi	c	10⁻²	1 cm = 0.01 m
milli	m	10⁻³	1 mm = 0.001 m
micro	µ	10⁻⁶	1 µC = 10⁻⁶ C
nano	n	10⁻⁹	1 nm = 10⁻⁹ m

Click to see Q & A

What is the SI unit of electric current?
Ans. Ampere (A)
Which is the only base unit still defined by a physical artifact?
Ans. Kilogram (IPK, France)
Convert 5 MHz to Hz.
Ans. 5 × 10⁶ Hz
What is the symbol for the unit of luminous intensity?
Ans. cd (candela)
1 newton is equivalent to how many dyne?
Ans. 1 N = 10⁵ dyne
Which derived unit equals kg·m²·s⁻³?
Ans. Watt (power)
What is the SI unit of frequency?
Ans. Hertz (Hz)
How many base SI units are there?
Ans. 7
The kelvin scale starts from which absolute zero value?
Ans. 0 K = –273.15 °C
Which unit replaced “cycles per second”?
Ans. Hertz (Hz)

Metre-length, kilogram-mass, second-time, ampere-current, kelvin-temperature, mole-substance, candela-light