# Top 7 Prefixes in Electrical and Electronics Engineering

Electrical quantities such as resistance, voltage, power, inductance and capacitance can have very large values. For example a power station can generate 1,000,000,000 watts of power, similarly an inductor can have a value of 0.00001 H. To keep things straight forward, a common practice is to use prefixes. Each prefix represents a power of ten. The table below display top 7 prefixes that are very common in Electrical and Electronics Engineering.

 Number Power of 10 Prefix Symbol 1 000 000 000 109 giga G 1 000 000 106 mega M 1 000 103 kilo k 0.001 10-3 milli m 0.000 001 10-6 micro μ 0.000 000 001 10-9 nano n 0.000 000 000 001 10-12 pico p

Examples

Example 1: Express 33000 V in kilovolts.

Solution: Multiply and divide the number by 1000

= 33000 V * (1000/1000)

= (33000/1000) V * 1000

= 33 kV

Example 2: Express 0.222 A in milliAmps.

Solution: Multiply and divide the number by 0.001.

= 0.222 * (0.001/0.001) A

= 0.222 * (m/0.001) A

= (0.222/0.001) mA

= 222 mA

Categories EEE