Question

46. Perhatikan gambar!

Bila amperemeter menunjuk angka 0,6 A,
maka nilai yang terukur pada Volmeter adalah
Jika
ham
arus
RE
A
A. 1,5 Volt
B. 3,4 Volt
C. 4,5 Volt
D. 6,2 Volt
A
paraan berikut van tidak benar dari​

Answer 1

B. 3,4 Volt

Explanation:

Here we need to use Ohm's Law, because we have electric current, voltage and resistances. This law state:
`V=IR`

So, first we need to calculate the total resistance to then find the voltage. The resistances can be placed in two ways: in parallel, in series.

The pair 4 and 8 ohms are parallel, so we solve:

`R_(T)=(1)/(R_(1))+(1)/(R_(2))`

`(1)/(R_(T))=(1)/(4)+(1)/(8)=(8+4)/(32)=(12)/(32)=(3)/(8)`

Which is,
`R_(T)=frac{8}{3}`

Now, this total resistance of parallels ones is placed in series with the 3 ohm resistance, in this case we just sum, because they are in series:

`R=3+(8)/(3)=(9+8)/(3)=(17)/(3)=5.67 ohm`

Now that we have the total resistance of the circuit, we use the Ohm's Law:

`V=IR\\V=(0.6A)(5.67ohm)=3.4 Volt`

Therefore, the right answer is B.