The reason you feel momentarily cool when steeping out of a swimming pool even o

Question

The reason you feel momentarily cool when steeping out of a swimming pool even on a hot day a. The water near the surface of the pool is colder than the water at the bottom. b. The energy required to evaporate the liquid water on your skin is taken from your body c. Water is such a dense material The voltage across a 10 ohm resistor carrying S Amps of current is a. 10 Volts b. 5 Volts c. 3 Volt d. 50 Volts How much energy does a heater use if it runs for 10 minutes when connected to a 120 Volts outlet draw Amps of current? a. 12 joules b. 1200 joules c. 720000 joules An atom is neutral because the number of electrons circling the nucleus is a. An even number b. The same as the number of protons in the nucleus c. The same as the number of neutrons in the nucleus Heat a copper wire and its electric resistance a. Increases b. Decreases c. Remains the same Current in a circuit can be increased by a. Increasing the voltage across it b. Reducing its resistance c. Both of these d. Neither of these If you stretch a copper wire so that it becomes thinner and longer, the resistance between a. larger b. smaller c. The resistance remains unchanged The power needed for a device drawing 0.8 Amps when connected to 120 V is a. 15 W b. 120 W c. 60 W

Explanation / Answer

15) correct option is (b)

16) R = 10 ohms , V = 5 A

V = I*R = 10*5 = 50 V

correct option is (d)

17) V = 120 V, I = 10 A, t = 10 mintues

P = VI = Q/t

Q = VI*t

Q = 120*10*10*60 = 720000 J

corect option is (c)

18) correct option is (b)

19) correct option is (b)

20) V = IR

correct option is (C)

21) R = pL/A

correct option is (a)

22) V =120 V, I = 0.8 A

P =120*0.8 = 96 W

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