4. A well-insulated electric water heater, consisting of a coil made of Nichrome, can warm 5.0L of water from 20.0°C to 49°C in 20 minutes. Density of water = 1 g/cm3 Specific heat of water = 4.186 J/g.°C Resistivity of Nichrome = 1.1x10-6 Ω.m Temperature Coefficient of Nichrome = 0.00041/°C Density of Nichrome = 8.4 g/cm3 (a) How much power is the water heater drawing if the heater has an efficiency of 90%? (b) The water heater is connected to a 240V source. Calculate the resistance of the coil. (c) The total mass of the nichrome coil is 800g. Find the length and diameter of the wire.

4. A well-insulated electric water heater, consisting of a coil made of Nichrome, can warm 5.0L of water from 20.0°C to 49°C in 20 minutes. Density of water = 1 g/cm3 Specific heat of water = 4.186 J/g.°C Resistivity of Nichrome = 1.1x10-6 Ω.m Temperature Coefficient of Nichrome = 0.00041/°C Density of Nichrome = 8.4 g/cm3 (a) How much power is the water heater drawing if the heater has an efficiency of 90%? (b) The water heater is connected to a 240V source. Calculate the resistance of the coil. (c) The total mass of the nichrome coil is 800g. Find the length and diameter of the wire.