Question

Question

10 of 20

Which of the following explains why international travelers need to use special adapters when plugging a device designed to operate in the U.S. into a wall outlet in Europe (i.e., Vrms in the U.S. is 120 V, while Vrms in Europe is 240 V)?

            The increased voltage causes the device's resistance to increase, and the device won't work.

            The increased voltage causes the device's resistance to decrease, and the device will overheat.

            The increased voltage causes an increase in power usage, and the device will overheat.

            The increased voltage causes a decrease in power usage, and the device won't work.

Question

11 of 20

A 9.0V battery connects to a wire resistor. The wire resistor is tungsten (ρ = 5.6 x 10-8 Ω-m) 0.5 m long, has a radius of 1.2 x 10-5 m. What is the current through the resistor?

            62 A

            0.15 A

            6.9 A

            None of the above

Question

12 of 20

The purpose of a battery in a circuit is to act as a source of

            A) resistance.

            B) charge.

            C) energy.

            D) both b and c.

Question

13 of 20

The U.S. has an alternating current frequency of 60 Hz. China has an alternating current frequency of 50 Hz. This means that

            the number of times voltage cycles in a minute in the U.S. is greater than the number of times voltage cycles in China.

            the peak voltage in China is smaller than the peak voltage in the United States.

            the peak current in China is smaller than the peak current in the United States.

            more than one of the above options is accurate.

Question

14 of 20

A particular alternating voltage supply completes one full voltage cycle every 10 sec. A resistor connects to the alternating voltage supply. The resulting current will cycle at a frequency

            greater than 10 Hz.

            less than 10 Hz.

            equal to 10 Hz.

            More information is required. The amount of resistance must be known.

Question

15 of 20

A battery connects to a resistor with resistance R, and the resulting current is measured. The resistor is removed, and a new resistor with a resistance of 2R is added. As a result,

            the voltage will double.

            the current will double.

            the charge speed will double.

            None of the above options are correct.

Answer 1