1. What voltage must a battery have to produce 0.25 A current through a 9.0 Q resistor?

2. You get out of the shower and touch an exposed wire from your old hair dryer which is plugged into a 125 volt outlet. When the human body can have a resistance of about 600 0. What will be the current through your
body?

3. What voltage will produce a 0.75 A current through a 536 0 resistor?

4. The heating element in an electric heater has a resistance of 12.06 R. What will be the current through the heating element when it is connected to a 350 V source?

5. A hair dryer draws 10. 5 A when it is plugged into a 140 V outlet. What is the resistance of the hair dryer?

Using Ohm's Law

Question

Answered

Sagot :

Creepy87go Creepy87go · Answer 1

Answer:

1. The total resistance around the loop is Rt = 0.5 + 4.0 = 4.5 Ohms.

2. The loop current is I = 3.0v/4.5 Ohms = 2/3

3. The terminal voltage is Vt = 3.0v - 0.5 Ohms x 2/3 Amp = 3.0v - 0.333v = 2.667v.

The heating element in an electric heater

4. has a resistance of 10.60. What will be the

current through the heating element when it is

connected to a 240 V source?

Explanation:

5. R = V / I

= 120 / 7

= 17.14 ohms

Amount of charge, Q = I x t

= 7 x 12 x 60 [converting into seconds as current, I is Coulomb (C) per second]

= 5040 C