Question

question 81 of 99
which of the following statements are true regarding power - supply wattage? (select two.)
the wattage requirement for each individual circuit uses the formula w = v x a.
the lower the wattage rating, the more amps a power supply can deliver.
a systems wattage requirement does not depend on the number of devices in the system.
a systems wattage requirement equals the highest wattage requirement for a single individual circuit.
the watt rating indicates how much power can be supplied to various devices.
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Explanation:

Step1: Analyze formula for power

The power formula is $P = V\times A$ (where $P$ is power in watts, $V$ is voltage and $A$ is current). Each individual circuit uses this formula for its power - related calculations. So, the statement "The wattage requirements for each individual circuit uses the formula $W = V\times A$" is correct.

Step2: Analyze relationship between voltage and current

According to Ohm's law $I=\frac{V}{R}$ (where $I$ is current, $V$ is voltage and $R$ is resistance). For a fixed - resistance circuit, the lower the voltage rating, the lower the current (amps) a power supply can deliver. So, the statement "The lower the wattage rating, the more amps a power supply can deliver" is incorrect.

Step3: Analyze system voltage requirements

A system's voltage requirement is determined by the overall design and the components' needs, not just the highest voltage requirement of a single individual circuit. For example, in a parallel - connected circuit system, the voltage across each component is the same as the supply voltage, and the system voltage is set to meet the common needs of all components. So, the statement "A system's wattage requirements does not depend on the number of devices in the system" is incorrect.

Step4: Analyze watt rating meaning

The watt rating of a power supply indicates the maximum power it can supply to various devices. Power is the rate of energy transfer, and the watt rating tells us how much energy can be provided per unit time to power the connected devices. So, the statement "The watt rating indicates how much power can be supplied to various devices" is correct.

Answer:

The wattage requirements for each individual circuit uses the formula $W = V\times A$; The watt rating indicates how much power can be supplied to various devices.