Problem 1. A hair dryer with an rms voltage of 120 V has two power settings 750

Question

Problem 1. A hair dryer with an rms voltage of 120 V has two power settings 750 w and 1000 w. A) Find the peak voltage. B) Find the rms current for each setting. C) Find the peak current for each setting. D) Find the resistance of the hair dryer for each setting. Problem 2. Why are household circuits wired in parallel? Problem 3. A) What are the voltages of the three slots of a standard outlet in the United States? B) What is the purpose of the dedicated ground in a three-slot outlet? C) Why are two-pronged plugs polarized (only fit into outlet slot in one orientation)? D) Why does standing in water increase the danger associated with touching a high voltage wire? Problem 4. (20 pts) Consider the circuit shown below. Take Ri 202, R2 R3 102, and R4 Rs 302. Further 12-3 A. A) What is the equivalent resistance of the resistor network? B) Find 11 and 13? C) Find the voltage Vo across the battery. D) What is V Va? Problem 5. A) How do the sources of electric fields and magnetic fields differ? B) How does the nature of electric fields differ from the nature of magnetic fields? Problem 6. Consider two long parallel wires each carrying a current of 2 A. The wires are separated by a distance of 0.2 m. Find the size of the magnetic field at a point midway between the wires if A) The currents in the wires are in the same direction. B) The currents in the wires are in opposite directions.

Explanation / Answer

Solution 2:- Household circuits are wired parallel because in parallel the voltage remain the same and current is divided. Every device in the house operate at 230 V, 60 Hz. If series connections are recommended then the voltage are reducing from source end to terminal end. The device at the end may not be operated due to very less voltage. In parallel the resistance is reduced which reduce the power cosumptions in the houses.

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