An electric toaster uses nichrome for its heating element. When a negligibly small current passes through it, its resistance at room temperature (27.0 °C) is found to be 75.3 Ω. When the toaster is connected to a 230 V supply, the current settles, after a few seconds, to a steady value of 2.68 A. What is the steady temperature of the nichrome element? The temperature coefficient of resistance of nichrome averaged over the temperature range involved is 1.70 × 10^–4 °C^–1

^{$1. {827}^0 C$
$2. {820}^0 C$
$3. {847}^0 C$
$4. {800}^0 C$}

The resistance of the platinum wire of a platinum resistance thermometer at the ice point is 5 Ω and at the steam point is 5.23 Ω. When the thermometer is inserted into a hot bath, the resistance of the platinum wire is 5.795 Ω. The temperature of the bath is:

$1. 300.{20}^{0}C$
$2. 345.{65}^{0}C$
$3. 320.{20}^{0}C$
$4. 400.{12}^{0}C$

A light bulb is rated at 100 W for a 220 V supply, the resistance of the bulb is:

$1. 423 \Omega$
$2. 440 \Omega$
$3. 444 \Omega$
$4. 484 \Omega$