# FREE Amazon Maintenance Technician: Math Ohm’s Law Question and Answers

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#### The power unit is:

Correct! Wrong!

Explanation:
The unit of power is the watt (W), which is named after the Scottish inventor James Watt. One watt is defined as the rate at which energy is transferred or work is done when one ampere of current flows through a conductor with a potential difference of one volt. In other words, one watt can be thought of as the "amount" of work done or energy transferred per unit of time. Power is a fundamental quantity in physics and engineering, and it is used to describe the rate at which energy is transformed or work is done, as well as the rate at which electrical energy is consumed or produced in a circuit.

#### A 5-V battery powers a 10 ohm resistor. The source's current is as follows:

Correct! Wrong!

Explanation:
Using Ohm's law, we can calculate the current flowing through a resistor given its resistance and the voltage applied across it. In this case, we are given a 10 ohms resistor powered by a 5-V battery, and we need to calculate the current flowing through the source.
We can use the formula:
I = V / R
where I is the current (in amperes), V is the voltage (in volts), and R is the resistance (in ohms).
Plugging in the values given, we get:
I = 5 V / 10 ohms
I = 0.5 A

Therefore, the current flowing through the source is 0.5 amperes.

#### The current unit is:

Correct! Wrong!

Explanation:
The unit of electric current is the ampere (A), which is named after the French physicist André-Marie Ampère. One ampere is defined as the amount of electric charge that passes through a conductor in one second when a current of one ampere is flowing. In other words, an ampere can be thought of as the "rate of flow" of electric charge. Electric current is a fundamental quantity in electrical engineering and is used to describe the behavior of electric circuits, including the behavior of resistors, capacitors, and other devices.

#### The following phrase accurately summarizes Ohm's law:

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Explanation:
Ohm's law states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points, provided that the temperature and other physical conditions remain constant. This relationship is expressed mathematically as:
V = I x R
where:
V is the voltage (in volts)
I is the current (in amperes)
R is the resistance (in ohms)

#### I = ___ if P = 50 watts and R = 2 ohms.

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Explanation:
We can use the formula for electrical power, which relates power (P) to current (I) and resistance (R) in a circuit, to calculate the current flowing through a conductor given its resistance and the power dissipated by it. The formula is:
P = I^2 * R
We can rearrange this formula to solve for I:
I = sqrt(P / R)
Plugging in the given values, we get:
I = sqrt(50 watt / 2 ohms)
I = sqrt(25)
I = 5 A

Therefore, the current flowing through the conductor is 5 amperes.

#### R = ___ if V = 50 V and I = 5 A:

Correct! Wrong!

Explanation:
We can use Ohm's law to calculate the resistance of a conductor given the voltage and current flowing through it. Ohm's law states that the resistance (R) of a conductor is equal to the voltage (V) across the conductor divided by the current (I) flowing through it. Mathematically, this can be expressed as:

R = V / I
Plugging in the given values, we get:
R = 50 V / 5 A
R = 10 ohms

Therefore, the resistance of the conductor is 10 ohms.

#### The voltage unit is:

Correct! Wrong!

Explanation:
The unit of voltage is the volt (V), which is named after the Italian physicist Alessandro Volta. One volt is defined as the potential difference between two points in a conductor when a current of one ampere flowing through the conductor dissipates one watt of power between those points. In other words, one volt can be thought of as the "pressure" or "force" that drives electric current through a circuit. Voltage is a fundamental quantity in electrical engineering and is used to describe the behavior of electric circuits, including the behavior of electric motors, generators, and other devices.