Question 162: Current Electricity

Question

An electric toaster has resistance of $$60 \Omega$$ at room temperature $$\left(27^{\circ} \mathrm{C}ight)$$. The toaster is connected to a $$220 \mathrm{~V}$$ supply. If the current flowing through it reaches $$2.75 \mathrm{~A}$$, the temperature attained by toaster is around : ( if $$\alpha=2 	imes 10^{-4}$$/$$^\circ  \mathrm{C}$$)

Accepted Answer

$$\begin{aligned}
& \mathrm{R}_{\mathrm{T}-27}=60 \Omega, R_T=\frac{220}{2.75}=80 \Omega \
& \mathrm{R}=\mathrm{R}_0(1+\alpha \Delta \mathrm{T}) \
& 80=60\left[1+2 	imes 10^{-4}(\mathrm{~T}-27)ight] \
& \mathrm{T} \approx 1694^{\circ} \mathrm{C}
\end{aligned}$$

Answer

1235 $$^\circ$$C

Answer

1667 $$^\circ$$C

Answer

694 $$^\circ$$C

Answer

1694 $$^\circ$$C

Current Electricity

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