An electric toaster has resistance of 60 Ω at room temperature 27 ° C . The toaster is connected to a 220 V supply. If the current flowing through it reaches 2 . 75 A , the temperature attained by toaster is around: (if α = 2 × 10 - 4 C - 1 ∘ )

Question

An electric toaster has resistance of 60 Ω at room temperature 27 ° C . The toaster is connected to a 220 V supply. If the current flowing through it reaches 2 . 75 A , the temperature attained by toaster is around: (if α = 2 × 10 - 4 C - 1 ∘ ), 694 ° C, 1235 ° C, 1694 ° C, 1667 ° C

MARKS App · Accepted Answer

Resistance at 27 ° C , R T = 27 = 60 Ω . Final resistance, R T = 220 2 . 75 = 80 Ω . Now, we can write R = R 0 ( 1 + α Δ T ) ⇒ 80 = 60 1 + 2 × 10 - 4 ( T - 27 ) ⇒ T ≈ 1694 ° C

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