{"id":1636,"date":"2018-03-28T15:03:28","date_gmt":"2018-03-28T07:03:28","guid":{"rendered":"https:\/\/gurumuda.net\/physics\/?p=1636"},"modified":"2023-08-10T00:38:10","modified_gmt":"2023-08-10T00:38:10","slug":"ohms-law-problems-and-solutions","status":"publish","type":"post","link":"https:\/\/gurumuda.net\/physics\/ohms-law-problems-and-solutions.htm","title":{"rendered":"Ohm’s law – problems and solutions","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Ohm’s law – problems and solutions<\/span><\/p>\n

1. <\/span><\/p>\n

Based on the table below, the relation between voltage<\/a> (V), electric current<\/a> (I) and resistance (R) is…..<\/span><\/p>\n

\"Ohm'sSolution :<\/span><\/p>\n

Ohm’s law :<\/span><\/p>\n

V = I R or R = V \/ I<\/span><\/p>\n

R1<\/sub> = V \/ I = 1.50 \/ 0.08 = 18.75 Ohm<\/span><\/p>\n

R2<\/sub> = V \/ I = 2.80 \/ 1.50 = 2.87 Ohm<\/span><\/p>\n

R3 <\/sub>= V \/ I = 3.99 \/ 2.10 = 1.9 Ohm <\/span><\/p>\n

Based on the table, the relationship between V, I and R is the value of R inversely proportional to V and I. That means the larger the V and I, the smaller R.<\/span><\/p>\n

The value of V \/ I is not constant so it does not illustrate Ohm’s law<\/a>. According to Ohm’s law, the value of V \/ I must be constant.<\/span><\/p>\n

2. Which graph indicates the relationship between the potential difference with the electric current?<\/span><\/span><\/p>\n

\"Ohm's<\/span><\/p>\n

Solution :<\/span><\/p>\n

A<\/span><\/p>\n

3. Based on the data in the following <\/span>table of the <\/span>experiment result, it can be concluded that the electric current …<\/span><\/span><\/p>\n

\"Ohm'sSolution :<\/span><\/p>\n

Based on the data in the table, the greater the electrical voltage, the greater the electric current. Therefore it is concluded that the electric current is proportional to the voltage.<\/span><\/p>\n

4. A device has a 150 Ohm resistance and a 2A electric current passes. The potential difference<\/a> is…<\/span><\/p>\n

Known :<\/u><\/span><\/p>\n

Resistance (R) = 150 Ohm<\/span><\/p>\n

The electric current (I) = 2 Ampere<\/span><\/p>\n

Wanted:<\/u> Voltage (V)<\/span><\/p>\n

Solution :<\/u><\/span><\/p>\n

V = I R<\/span><\/p>\n

V = electric voltage, I = electric current, R = electric resistance<\/i><\/span><\/p>\n

Voltage :<\/span><\/p>\n

V = I R = (2 Ampere)(150 Ohm) = 300 Volt<\/span><\/p>\n

5. The electric current in a resistor wire is 4 A. When both ends are given a potential of 12 Volts. What is the electrical resistance?<\/span><\/span><\/p>\n

Known :<\/u><\/span><\/p>\n

Electric current (I) = 4 Ampere<\/span><\/p>\n

Voltage (V) = 12 Volt<\/span><\/p>\n

Wanted :<\/u> Electric resistance (R)<\/span><\/p>\n

Solution :<\/u><\/span><\/p>\n

Resistance :<\/span><\/p>\n

R = V \/ I = 12 Volt \/ 4 Ampere = 3 Ohm<\/span><\/p>\n

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  1. What is Ohm’s Law?<\/strong><\/span>\n