Resistors are a necessity when investigating electrical circuits. Use resistors to confirm Ohm's law or design a challenge to illuminate an LED. Set includes 600 total resistors, 100 of each of the following resistance values: 39 Ω, 220 Ω, 620 Ω, 1.1 kΩ, 8.2 kΩ, and 47 kΩ. Rated 1/2 watt.