I connected 4 x 1000Ω resistors in parallel. Left side is 5V and right side is ground. 1 1 1 1 1- = - + - + - + -R(total) R1 R2 R3 R41 1 1 1 1- = - + - + - + -R(total) 1k 1k 1k 1k1 4 - = - R(total) 1k1 1 - = - R(total) 250R(total) = 250ΩJust the four resistors in parallel are 250Ω 1 1 1 ---- = ----- + ----- 231 Runo 2501 250 + Runo--- = --------------231 250 * Runo250 * Runo = 231 ( 250 + Runo )57750 = (250 – 231) Runo 57750----------- = Runo = 3.039kΩ 19