Transformers: The secondary coil of an ideal neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What current does the primary draw?
A. 0.625 A
B. 0.625 mA
C. 0.160 A
D. 1.66 A
Answer: A
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A molecule takes 3.0 seconds to diffuse across a membrane. If the thickness of the membrane is doubled, then how long does it take the molecule to diffuse across the thicker membrane?
A. 30 hours B. 24 hours C. 20 hours D. 18 hours E. 12 hours
The prefixes which are abbreviated f, d, and T represent which of the following?
a. 10-15, 102, and 1024
b. 10-30, 10-2, and 1024
c. 1?0-30, 10-1, and 10-2
d. 10-13, 102, and 1024
e. 10-15, 10-1, and 1012
Why are inverters necessary for use with photovoltaic cells connected to the grid? Can solar electricity from photovoltaic cells be used without using an inverter?
What will be an ideal response?
The Earth's magnetic field
A) never appreciably changes. B) has reversed itself many times. C) is centered at Earth's core. D) both B and C