Power Supply and Electrical Units Quiz

Ohm's Law states that voltage (V) is equal to the current (I) multiplied by the resistance (R), expressed as V = IR. In an electrical system, power (P) is equal to the voltage multiplied by the current, expressed as P = VI. This relationship between voltage, current, and resistance is fundamental to understanding electricity and power supply specifications.

The voltage selector switch on a power supply sets the input voltage to either 110V / 115V or 220V / 230V. It is important to set it correctly based on the country where the power supply is used to avoid damaging the power supply and other computer components.

In an electrical system, power (P) is equal to the voltage (V) multiplied by the current (I), expressed as P = VI. Power supply specifications are typically expressed in watts (W), with different amperages delivered for each output voltage. Understanding the relationship between wattage, voltage, and amperage is crucial for determining the appropriate power supply for a computer system.

<p>A dual voltage power supply has a voltage selector switch that allows it to be set to different input voltages (110V / 115V or 220V / 230V), making it suitable for use in different countries. A power supply without a voltage selector switch automatically detects and sets the correct voltage. The correct voltage setting is crucial for the safe and efficient operation of the power supply and the computer system.</p> Signup and view all the answers

<p>Electronic capacitors located inside of a power supply can hold a charge for extended periods of time.</p> Signup and view all the answers

<p>To protect against damage from surges and spikes by diverting extra electrical voltage to the ground.</p> Signup and view all the answers

<p>To safely shut down the computer and save data prior to the UPS losing all battery power.</p> Signup and view all the answers

<p>To provide a backup battery to supply power when the incoming voltage drops below the normal level.</p> Signup and view all the answers

<p>Computer components might not operate correctly.</p> Signup and view all the answers

<p>Blackout, brownout, noise, spike, power surge.</p> Signup and view all the answers

<p>A power surge lasts for a few nanoseconds, or one-billionth of a second.</p> Signup and view all the answers

<p>Joules.</p> Signup and view all the answers

<p>The printer could overload the UPS.</p> Signup and view all the answers

<p>Constantly recharging while the UPS is in use.</p> Signup and view all the answers

<p>To help protect against potential electrical power problems by supplying a consistent level of electrical power to a computer or other device.</p> Signup and view all the answers

<p>To turn the power supply on or off.</p> Signup and view all the answers

<p>Unsteady voltages can cause computer components to not operate correctly and can lead to data loss or hardware failure.</p> Signup and view all the answers

<p>Do not open a power supply as electronic capacitors located inside can hold a charge for extended periods of time.</p> Signup and view all the answers

<p>The types of AC power fluctuations mentioned are blackout, brownout, noise, spike, and power surge.</p> Signup and view all the answers

<p>A surge protector helps protect against damage from surges and spikes by diverting extra electrical voltage to the ground.</p> Signup and view all the answers

<p>The recommended action for a UPS facing a potential blackout is to safely shut down the computer and save data prior to the UPS losing all battery power.</p> Signup and view all the answers

<p>The voltage selector switch allows the user to choose the input voltage for the power supply. It is important to set it correctly to match the voltage of the local power grid and avoid damage to the equipment.</p> Signup and view all the answers

<p>The amount of protection offered by a surge protector is measured in joules.</p> Signup and view all the answers

<p>The power on/off switch is used to turn the power supply on or off.</p> Signup and view all the answers

<p>A standby power supply provides a backup battery to supply power when the incoming voltage drops below the normal level.</p> Signup and view all the answers

<p>A power surge lasts for a few nanoseconds, or one-billionth of a second.</p> Signup and view all the answers

<p>Power is equal to the voltage multiplied by the current: P = VI.</p> Signup and view all the answers

<p>The purpose of the voltage selector switch is to set the input voltage to the power supply to the correct value based on the country where it is used.</p> Signup and view all the answers

<p>Setting the voltage switch to the incorrect input voltage could damage the power supply and other parts of the computer.</p> Signup and view all the answers

<p>A dual voltage power supply allows the user to manually set the input voltage, while a power supply without a voltage selector switch automatically detects and sets the correct voltage.</p> Signup and view all the answers

<p>Ohm's Law expresses how voltage is equal to the current multiplied by the resistance: V = IR. It relates to power supply specifications by defining the relationship between voltage, current, and resistance in an electrical system.</p> Signup and view all the answers

<p>The equation V = IR represents Ohm's Law, where voltage (V) is equal to the current (I) multiplied by the resistance (R).</p> Signup and view all the answers

<p>The equation P = VI represents the relationship between power (P), voltage (V), and current (I) in an electrical system.</p> Signup and view all the answers

<p>The function of a power supply voltage selector switch is to allow users to manually set the input voltage to the power supply based on the country's voltage standard.</p> Signup and view all the answers

<p>Power supply specifications are typically expressed in watts (W).</p> Signup and view all the answers

<p>The measurement used to determine the amount of electrons moving through a circuit per second is Amperes, or Amps (A).</p> Signup and view all the answers

<p>To divert extra electrical voltage to the ground during surges and spikes</p> Signup and view all the answers

<p>To provide a backup battery to supply power when the incoming voltage drops below the normal level</p> Signup and view all the answers

<p>The UPS might not be able to handle the power load of the printer</p> Signup and view all the answers

<p>To adjust the input voltage to match the local electrical system</p> Signup and view all the answers

<p>To provide a backup battery to supply power when the incoming voltage drops below the normal level</p> Signup and view all the answers

<p>Blackout, brownout, noise, power surge</p> Signup and view all the answers

<p>To control the supply of power to the entire power supply unit</p> Signup and view all the answers

<p>The power supply unit may overheat and cause damage</p> Signup and view all the answers

<p>Joules</p> Signup and view all the answers

<p>To supply power when the incoming voltage drops below the normal level</p> Signup and view all the answers

<p>V = IR</p> Signup and view all the answers

<p>P = VI</p> Signup and view all the answers

<p>To set the input voltage to the power supply</p> Signup and view all the answers

<p>P = VI</p> Signup and view all the answers

<p>Damaging the power supply and other parts of the computer</p> Signup and view all the answers

<p>Sets the input voltage to the power supply</p> Signup and view all the answers

<p>It allows adjustment of the input voltage based on the country's voltage standards</p> Signup and view all the answers

<p>Expresses the relationship between voltage, current, and resistance</p> Signup and view all the answers

<p>To accommodate different input voltage standards based on the country</p> Signup and view all the answers

<p>It could lead to damage of the power supply and other computer parts</p> Signup and view all the answers