2. A tungsten filament has a resistance of 133 Ω at 1500C. If the temperature coefficient of resistance at 00C of tungst

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2. A tungsten filament has a resistance of 133 Ω at 1500C. Ifthe temperature coefficient of resistance at 00C of tungsten is0.0045/C0 , what would be the resistance of the filament at 5000C?3. A 2.0 mm diameter iron wire carries a current of 2.5 A.Determine : a.) the electric field magnitude in the wire b.) thepotential difference between 2 points in the wire 20 m apart. c.)the resistance of this 20m length of the wire. 4. What is theresistance of an immersion heater that increases the temperature of1.0 kg of water from 200C to 1000C in 20 minutes while operating at220 v? 5. A 1.0-Ω resistor is connected across a battery having anemf of 6 v. If the resistor has to dissipate heat at the rate of 25watts, determine : a.) the potential difference across the resistorb.) the internal resistance of the battery. 6. An electric deviceconnected to 220-v source draws a current of 4.55 A . It isoperated 8 hours a day. a.) Determine the daily power and energyconsumption of the device b.) If electric energy costs PhP10.25/kwHr, how much would it cost to operate the device in 30days?