Series Circuit Physics Example 3

Solution

1. 1
   Total resistance: $R_T = \frac{V}{I} = \frac{6}{0.5} = 12 \text{ } \Omega$.
2. 2
   Unknown resistance: $R_2 = 12 - 3 = 9 \text{ } \Omega$.
3. 3
   Power in $R_1$: $P_1 = I^2 R_1 = (0.5)^2 \times 3 = 0.75 \text{ W}$.
4. 4
   Power in $R_2$: $P_2 = I^2 R_2 = (0.5)^2 \times 9 = 2.25 \text{ W}$.