Bundle: Sustainable Energy, 2nd + Mindtap Engineering, 1 Term (6 Months) Printed Access Card
2nd Edition
ISBN: 9781337896535
Author: Richard A. Dunlap
Publisher: Cengage Learning
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Chapter 1, Problem 9P
To determine
Find the current flowing through the given resistor.
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- One of the most common appliances used on a daily basis is the hair dryer. A hair dryer is basically a duct in which a few layers of electric resistors are placed. A small fan at the back of the device pulls the air in and forces it through the resistors where it is heated (see Fig. 1). The power consumed by the heating elements (i.e. electric resistors) of the hair dryer is 1258 Watts. Air enters the hair dryer at 95 kPa and 25°C and leaves at 50°C. The cross-sectional area of the hair dryer at the exit is 55 cm². The power consumed by the fan is 2 Watts and the heat loss through the walls of the hair dryer is 5 Watts. By clearly stating your assumptions throughout, 1.Analytically describe the Fluid Mechanics and Thermodynamics working principles of the hairdryer; 2. Provide a schematic diagram of the hair dryer clearly indicating the system's boundaries, mass flows and energy/heat flows; 3. Determine the volumetric flow rate of the air at the inlet; 4. Determine the velocity of the…arrow_forward509% Part (b) Consider a 5.0om long wire of mass 10.0 g. The wire is suspended between the poles of a magnet as shown (end view of wire). When a 0.7 A current in the wire is turned on, the wire and magnet are attracted to each other. wire What can you learn about the magnet and the direction of the current through the wire with this information?arrow_forward4. An incandescent lamp has a tungsten filament whose resistance is 96 ohm at its operating temperature of 2900°C. Calculate the filament resistance when the lamp is disconnected from the electric source under which conditions the temperature is 24°C.arrow_forward
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