An electric iron is rated at 230V, 750W. Calculate i) the maximum current, ii) the number of units of electricity it would use in 30 minutes. b) Which of the following fuse ratings would be suitable for this electric iron? 1A, 3A, 5A, 13A.

1. Given, V = 230V P = 750W

T = 30/60 = 0.5 hours

1. Let the maximum current be I We know that,

P = VI 750 = 230I I = 3.26A

1. Electric energy consumed, E = PT E = 0.75kW×0.5 hours

E = 0.375 kWh

Therefore, the number of units used in 30 minutes = 0.375

1. The maximum current for the given iron is 26A, therefore, 5A fuse rating will be suitable for the electric iron.