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Chapter 30: Problem 15

Why can't we use a universal charger that plugs into a household electrical outlet to charge all our electrical appliances-cell phone, toy dog, can opener, and so on - rather than using a separate charger with its own transformer for each device?

Short Answer

Expert verified
Answer: A universal charger for all devices is impractical due to varying voltage requirements, power regulation needs, device compatibility, and safety and efficiency concerns. Each electronic device operates at a specific voltage level and requires appropriate transformers for proper charging and functioning. Additionally, various types of connectors used by different manufacturers add to the complexity of creating a universal charger.

Step by step solution

01

Understanding voltage requirements of electronic devices

Every electronic device operates at a specific voltage level, and has unique power requirements. These devices may vary in size, function, and voltage requirements making a universal charger impossible.
02

Power regulation in electronic devices

Electronic devices need to relate with the correct voltage input for their proper function. Providing the wrong voltage can damage or even destroy the internal circuits of the device. This is the reason why each device comes with its own charger that ensures the correct voltage and power regulation.
03

Transformers role in charging devices

Transformers are used in chargers to step down the voltage from the high voltage level of the household electrical outlet (usually 110V or 220V depending on the country) to the specific required voltage for each device. Since the voltage requirements vary from device to device, it would be difficult to have a universal charger with a single transformer for all devices.
04

Device compatibility

In addition to voltage and power requirements, there are various types of connectors used by different manufacturers for their devices. This makes the use of a universal charger even more complicated, as it would need to have different types of connectors compatible with all devices.
05

Safety and efficiency concerns

Using a universal charger with different voltage outputs and connectors comes with safety risks such as overheating, fires, and device damage. Furthermore, having a single charger to cater to multiple devices would result in inefficiencies, and in some cases, slower charging cycles. To sum up, a universal charger for all devices is impractical due to varying voltage requirements, power regulation needs, device compatibility, and safety and efficiency concerns. As a result, individual chargers with appropriate transformers are necessary to ensure the proper charging and functioning of each electronic device.

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Most popular questions from this chapter

The phase constant, \(\phi\), between the voltage and the current in an AC circuit depends on the ______. a) inductive reactance b) capacitive reactance c) resistance d) all of the above

What is the impedance of a series RLC circuit when the frequency of time- varying emf is set to the resonant frequency of the circuit?

A particular RC low-pass filter has a breakpoint frequency of \(200 .\) Hz. At what frequency will the output voltage divided by the input voltage be \(0.100 ?\)

A series RLC circuit has a source of time-varying emf providing \(12.0 \mathrm{~V}\) at a frequency \(f_{0}\), with \(L=7.00 \mathrm{mH}\), \(R=100 . \Omega,\) and \(C=0.0500 \mathrm{mF}\) a) What is the resonant frequency of this circuit? b) What is the average power dissipated in the resistor at this resonant frequency?

The discussion of \(\mathrm{RL}, \mathrm{RC},\) and \(\mathrm{RLC}\) circuits in this chapter has assumed a purely resistive resistor, one whose inductance and capacitance are exactly zero. While the capacitance of a resistor can generally be neglected, inductance is an intrinsic part of the resistor. Indeed, one of the most widely used resistors, the wire-wound resistor, is nothing but a solenoid made of highly resistive wire. Suppose a wire-wound resistor of unknown resistance is connected to a DC power supply. At a voltage of \(V=10.0 \mathrm{~V}\) across the resistor, the current through the resistor is 1.00 A. Next, the same resistor is connected to an AC power source providing \(V_{\mathrm{rms}}=10.0 \mathrm{~V}\) at a variable frequency. When the frequency is \(20.0 \mathrm{kHz},\) a current, \(I_{\mathrm{rms}}=0.800 \mathrm{~A},\) is measured through the resistor. a) Calculate the resistance of the resistor. b) Calculate the inductive reactance of the resistor. c) Calculate the inductance of the resistor. d) Calculate the frequency of the AC power source at which the inductive reactance of the resistor exceeds its resistance.
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