Which statement is NOT true?
a. A transformer contains a primary coil of wire and a secondary coil of wire wound around the same iron core.
b. A transformer changes one voltage to another.
c. A transformer works because changing magnetic fields can induce electric fields.
d. A transformer operates on direct current as well as on alternating current.
e. Transformers are commonly used for delivering household electric power.
d
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__________is microscopic solid grains in the interstellar medium
A) Main-sequence dust B) Interstellar dust C) Interstellar mud D) Main-sequence mud
Although Uranus and Neptune have no liquid metallic hydrogen in their interiors, they do have magnetic fields
a. True b. False Indicate whether the statement is true or false
Radiation: A blacksmith is flattening a steel plate having dimensions 10 cm × 15 cm × 1 mm. He has heated the plate to 900 K. If the emissivity of the plate is 0.75, at what rate does it lose energy by radiation? Ignore any heat exchange with the surroundings. (? = 5.67 × 10-8 W/m2 ? K4)
A. 360 W B. 760 W C. 790 W D. 850 W E. 880 W
Two resistors, A and B, are connected in a series circuit with a battery. The resistance of A is twice that of B. Which resistor dissipates more power?
1.Resistor A does. 2.Resistor B does. 3.More information is needed.