An electric circuit is formed when the electric charge moves or flows in a conductive path.The continuous movement or flow of electric charge in a circuit is referred to as current (I). Its unit is in amperes, which is also equivalent to . The force that moves the flow in a circuit is called voltage (V). It is the measure of potential energy between two points. Its unit is in volts which is equal to . As current move in conductors, there is some degree of friction or opposition to the motion. This opposition to the motion is referred to as resistance (R). Its unit is in ohms which is equal to. Thus, the amount of current in a circuit depends on the amount of voltage and amount of resistance.
Ohm's law describes further the relationship between current, voltage, and resistance. It specifically states that current is directly proportional to the amount of voltage and inversely proportional to the resistance. Mathematically, Ohm's Law can be expressed using the following formula:
V= IR, I = , and R =
Depending on what are the given values, we can just substitute the values to the above formulas to get the desired quantity.
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Verified answer
Ohm's Law
1. Given:
Voltage (V) = 12 v
Resistance (R) = 2 ohms
Asked: Current (I)
Equation: Current (I) =
Solution:
Current (I) =
=
= 6 amperes
Answer: Current = 6 amperes
2. Given:
Voltage (V) = 240 v
Current (I)= 15 A
Asked: Resistance (R)
Equation: Resistance (R) =
Solution:
Resistance (R) =
=
= 16 ohms
Answer: Resistance = 16 ohms
3. Given:
Voltage (V) = 110 v
Resistance (R) = 75 ohms
Asked: Current (I)
Equation: Current (I) =
Solution:
Current (I) =
=
= 1.47 amperes
Answer: Current = 1.47 amperes
4. Given:
Current (I) = 5.5 A
Resistance (R) = 20 ohms
Asked: Voltage (V)
Equation: Voltage (V) = IR
Solution:
Voltage (V) = IR
= (5.5)(20)
= 1210 volts
Answer: Voltage = 1210 v
5. Given:
Voltage (V) = 220 v
Current (I)= 12 A
Asked: Resistance (R)
Equation: Resistance (R) =
Solution:
Resistance (R) =
=
= 18.33 ohms
Answer = 18. 33 ohms
Explanation:
An electric circuit is formed when the electric charge moves or flows in a conductive path. The continuous movement or flow of electric charge in a circuit is referred to as current (I). Its unit is in amperes, which is also equivalent to . The force that moves the flow in a circuit is called voltage (V). It is the measure of potential energy between two points. Its unit is in volts which is equal to . As current move in conductors, there is some degree of friction or opposition to the motion. This opposition to the motion is referred to as resistance (R). Its unit is in ohms which is equal to . Thus, the amount of current in a circuit depends on the amount of voltage and amount of resistance.
Ohm's law describes further the relationship between current, voltage, and resistance. It specifically states that current is directly proportional to the amount of voltage and inversely proportional to the resistance. Mathematically, Ohm's Law can be expressed using the following formula:
V= IR, I = , and R =
Depending on what are the given values, we can just substitute the values to the above formulas to get the desired quantity.
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