$$\text { If } R _ { t } = \frac { R _ { 1 } R _ { 2 } } { R _ { 1 } + R _ { 2 } } , \text { where } R _ { 1 } = 3,300 \text { and } R _ { 2 } = 4,700 , \text { then } R _ { t } =$$
A)3,300
B)8,000
C)969
D)1,939

Question

Quizplus · Accepted Answer

The formula given is for calculating the total resistance $R_t$ of two resistors $R_1$ and $R_2$ connected in parallel. Plugging in the given values, $R_t = \frac{3300 \times 4700}{3300 + 4700} = \frac{15510000}{8000} = 1938.75$, which rounds to 1939, matching option D.

A)3,300 B)8,000 C)969 D)1,939

A)3,300
B)8,000
C)969
D)1,939