Can you explain how to get these answers PRACTICE PAGE Chapter 23 Electric Curre

Question

Can you explain how to get these answers PRACTICE PAGE Chapter 23 Electric Current Ohm's Law 1. How much current flows in a 1000-ohm resistor when 1.5 voits are impressed across it? CURRENT 0.ODISA USE OHMS LAW TO FIND THE 2. If the filament resistance in an automobile headlamp is 3 ohms, how many amps does it draw when connected to a 12-volt battery? YOU WANT COVER THE TER WITH YOUR REMAINING TWO AND THE 3The resistance of the side lights on an automobile is 10 ohms. How much current is in them when connected to 12 volts? SHOW YOU THE FORMULA! 12 A CONOCTORS AND RESISTORS HAVE RESISTANCE TO THE CURRENT IN THEM 4. What is the current in the 30-ohm heating coil of a coffeemaker that operates on a 120-volt circuit? 5. During a lie detector test, a voltage of 6 V is impressed across two fingers. When a certain question is asked, the resistance between the fingers drops from 400,000 ohms to 200,000 ohms. a What is the current intilly through the fingens 0:000016 A b. What is the current through the fingers when the resistance between them drops701000030A 6. How much resistance allows an impressed voltage of 6 V to produce a current of 0.006 A? 7. What is the resistance of a clothes iron that draws a current of 12 A at 120 V? O dhms 8. What is the yoltage across a 100-ohm circuit element that draws a current of 1 A? 100 OHM MY G00ODNESS 9. What voltage will produce 3 A through a 15-ohm resistor? 10. The current in an incandescent lamp is 0.5 A when connected to a 120-V circuit, and 0.2 A when connected to a 10-V source. Does the resistance of the lamp change in these cases? Explain your answer and it with numerical values. (12DV) / (0.54)-240S2

Explanation / Answer

We know that  

from Ohm's law V = I*R

I = V/R

R = V/I

1)

R = 1000 ohm , V = 1.5 V , I = ?

I = V/R

I = 1.5/1000 A

I = 0.0015 A

2)

R = 3 ohms  

V = 12 V

I = V/R = 12/3 = 4 A

3)

R = 10 ohm, V = 12 V , I = 12/10 = 1.2 A

4)

R = 30 ohm , V = 120 V

I = V/R = 120/30 = 4 A

5) voltage V = 6 V ,

resistance beforc fingers drops is R1 = 400,000 ohms ,

resistance after the fingers drops is R2 = 200,000 ohms ,

the current is I = V/R

I1 = v/R1 = 6/400000 A = 1.5*10^-5 A

I2 = v/R1 = 6/200000 A = 3*10^-5 A

6)

V = 6 v , I = 0.006 A, R = V/I = 6/0.006 = 6000/6 = 1000 ohms

7) R = V/I = 120/12 = 10 ohms

8) V = I*R = 1*100 = 100 V

9) V = I*R = 3*15 = 45 V

10) R = V/I

R1 = 120/0.5 ohm = 240 ohms

R2 = 10/0.2 = 50 ohms

so the resistance changes  

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