PROBLEM #1

A nine volt battery supplies power to a cordless curling iron with a resistance of 18 ohms. How much current is flowing through the curling iron?

Illustration:

---

Solution:

1. Since E (Voltage) and R (Resistance) are known, solve for I (Current) by dividing both sides of the equation by R.

   
   
   

2. Cancel the R's on the right hand side of the equation.

   
   
   

3. I is then left in terms of E and R.

   
   
   

4. Substitute in the values for E (Voltage) and R (Resistance).

   
   
   

5. Solve for I (Current).

   
   

next