PHYSICS HIGH SCHOOL

1. Calculate the resistance of a 12v, 20-amp circuit.

Answers

Answer 1
Answer:

Answer:

R = 0.6 ohms

Explanation:

We have,

Voltage of the circuit is 12 V

Current flowing in the circuit is 20 A

It is required to find the resistance of the circuit. Ohm'slaw gives the relationship between voltage, current and resistance. It is given by :

V=IR

R = resistance

R=(V)/(I)\n\nR=(12)/(20)\n\nR=0.6\ \Omega

so, the resistance of the circuit is 0.6 ohms.

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400J of heat is produced in 4 sec in 4ohm resistor.calculate yhe PD across the resistor.

Answers

Actually, after the information you gave, I expected you to ask for the voltage
across the resistor, so I'm not quite sure what you mean by 'PD'.  It could be the
"Potential Difference" or the "Power Dissipation" across the resistor.
Here are both answers:

Power Dissipation:
Power = Energy/time =  400 joules / 4 seconds = 100 joules/second = 100 watts.

Potential Difference (voltage):
Power dissipated by a resistor = (voltage)² / Resistance

100 watts = (voltage)² / 4 ohms

Multiply each side by 4 ohms:

400 watts-ohms = (voltage)²

Voltage = square root of 400 watts-ohms = 20 volts

Sal connected four light bulbs in a parallel circuit. If Sal adds another light bulb, what is true about the current in each bulb?A) The current decreased when a fourth bulb was added.

B) The current in the four bulbs is much less than the current in three bulbs.

C) The current in each bulb remained the same even though another bulb was added.

D) The current in the fourth bulb is less than the current int he other three bulbs.

Answers

Since all the bulbs are connected in parallel with each other

so here voltage across each bulb will remains the same

so here we will have

V = i R

now all bulbs are identical and we have same voltage source across all the bulbs

so we will have current in each bulb given by same equation

i = (V)/(R)

now we can say that correct answer will be

C) The current in each bulb remained the same even though another bulb was added.

The answer is C) The current in each bulb remained the same even though another bulb was added.

If a platinum wire has a resistance of 15 Ω and is connected across the terminals of a 3.0 V flashlight battery, how much current is in the wire?

Answers

The voltage is presented by the equation V = IR where V is voltage in V, I is current in amperes ad R is resistance in ohms. If a platinum wire has a resistance of 15 Ω and is connected across the terminals of a 3.0 V flashlight battery, the current can be solved through V= IR, 3.0 V = I (15 Ω), and the current is 0.2 A.

What occurs when parallel rays of light hit a rough or bumby surface

Answers

When parallel rays of light hit a rough or bumpy surface, there will be diffused reflection. Meaning, the light that bounces after it hits a rough or bumpy surface is not parallel anymore and cannot form an image. The answer to this question is 'diffused reflection'.

two cylinders p and q are made of copper the height of p is twice the height of q . the diameter of p is half the diameter of q

Answers

Answer:

Explanation:

Cylinder P is taller than cylinder Q. In fact, it's twice as tall. So if cylinder Q is, let's say, 10 inches tall, cylinder P would be 20 inches tall.

Cylinder P is also wider, but not by a lot. It's only half as wide as cylinder Q. So if cylinder Q has a width of 10 inches, cylinder P would have a width of 5 inches.

Now, let's talk about the insides of these cylinders, how much stuff they can hold. If we filled them up with something, like water, the bigger one (cylinder P) can hold twice as much as the smaller one (cylinder Q).

So, cylinder P can hold more stuff because it's both taller and a little wider than cylinder Q.

An engineer in India (standard household voltage = 220 volts) is designing a transformer for use on herupcoming trip to Canada (standard household voltage = 120 volts). If her input coil has 240 turns, how many
turns should her output coil have?

Answers

he should a step-up transformer with k=220/120=1.83 so output coil must have 240*1.83=440 turns
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