4. Temperature: symbol (K). Read as Kelvin. It is capital K. Kelvin is a base unit. Temperature’s popular conventional units for daily use are Degree Celsius and Degree Fahrenheit. Writing a temperature of 340 K or 240 Kelvin is correct. 240 °C and 240 °F (small symbol of degree ‘°’ appeared before C and F but not a symbol of degree is used when presented the temperature in Kelvin).
Note: 240 K and 240 °C and 240 °F are not the same values. There are certain conversion formulae for finding equivalent temperatures given on one scale to the others.
5. Current: symbol (A). Read as Ampere. It is capital A. Ampere is used for both alternate and direct current measurements. Writing 10 A or 10 Ampere is correct. 10 Amp. and 10 Amps. is not correct.
6. Volt: symbol (V). Read as Volt. It is capital V. 220 V or 220 Volt is correct.
