How much resistance must a 9-V device have to keep the current about 1 A? A) None of these.B) 1 ohm.C) 9 ohms.D) 4.5 ohms.E) 10 ohms.
To determine the answer, we can use Ohm's Law, which states that the current passing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance.
Ohm's Law can be expressed as follows:
I = V / R,
where I represents the current, V represents the voltage, and R represents the resistance.
In this case, we are given that the device operates at 9 volts and we want to find the resistance that would allow a current of approximately 1 ampere (A) to flow.
Plugging these values into the equation, we have:
1 A = 9 V / R.
Now, we can solve for the resistance (R):
R = 9 V / 1 A = 9 ohms.
Therefore, the correct answer is C) 9 ohms.