To measure the power consumed by your laptop computer you place an an ammeter in series with its DC power supply. When the screen is off ,the computer draws point 0.40 A of current. When the screen is on at full brightness it draws 0.90 A of current. Knowing the DC power supply delivers 16 volt, how much power is used by the screen?
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A voltmeter is always connected in parallel in the circuit to measure the potential difference between two points. because for measuring the voltage across some load in circuit the voltmeter must draw zero current , so voltmeter has a high value of resistance and is connected in parallel so that it draws no value of current.
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The answer to the question "To measure the power consumed by your laptop computer you place an an ammeter in series with its DC power supply. When the screen is off ,the computer draws point 0.40 A of current. When the screen is on at full brightness it draws 0.90 A of current. Knowing the DC power supply delivers 16 volt, how much power is used by the screen?" is
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