Yes! In fact all of these expressions are correct.
Using V = IR: R = V/I = 220/4.55 = 48.4 W
Using W = V2/R: R = V2/W = 2202/1000 = 48.4 W
Using W = I2R: R = W/I2 = 1000/4.552 = 48.4 W

 Now if V = 110 V
W = V2/R = 1102/48.4 = 250 W
I = W/V = 250/110 = 2.3 A

Return to Self Test 2