Ohm's Law: The current through a piece of lab equipment must be limited to 2.75 A when it is run by a 120-V dc power supply. What must be the resistance of this equipment?
Fill in the blank(s) with the appropriate word(s).
43.6 ?
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Why is the cosmic microwave background (CMB) so cold if the early universe was so hot?
a. Enough time has passed for matter in the universe to release enough heat to cool down. b. The CMB constantly interacts with atoms, which effectively cool down the photons. c. The expansion of the universe has redshifted those photons to an effectively cooler temperature. d. Misleading; The Big Bang was initially hot but the CMB was released from cold material much later on.
A current loop is oriented in three different positions relative to a uniform magnetic field. In position 1 the plane of the loop is perpendicular to the field lines. In position 2 and 3 the plane of the loop is parallel to the field as shown. The torque on the loop is maximum in
A. position 1. B. position 2. C. position 3 D. positions 2 and 3. E. all three positions.
The hydroxide ion has a charge of
a. 1–. b. zero. c. 1+. d. 2+.
A small bulb is rated at 7.5 W when operated at 125 V. Its resistance (in ohms) is
a. 0.45. b. 7.5. c. 17. d. 940. e. 2 100.