The potential difference across a fixed resistor is 6 V. What will happen to the current through this component when the potential difference across it is doubled?It will stay the sameIt is impossible to say without knowing the resistance of the resistorIt will halfIt will double2The current flowing through a 5000 Ω resistor is equal to 100 mA. Calculate the potential difference across the resistor.500,000 V0.02 V500 V50 V3The potential difference across a diode is equal to 0.6 V, and the current through it is equal to 2 A. Calculate the resistance of the diode.0.6 Ω1.2 Ω3.33 Ω0.3 Ω4There is a potential difference of 24 V across a 3 Ω resistor. Calculate the current flowing through it.8 A21 A72 A0.125 A
Question
The potential difference across a fixed resistor is 6 V. What will happen to the current through this component when the potential difference across it is doubled?It will stay the sameIt is impossible to say without knowing the resistance of the resistorIt will halfIt will double2The current flowing through a 5000 Ω resistor is equal to 100 mA. Calculate the potential difference across the resistor.500,000 V0.02 V500 V50 V3The potential difference across a diode is equal to 0.6 V, and the current through it is equal to 2 A. Calculate the resistance of the diode.0.6 Ω1.2 Ω3.33 Ω0.3 Ω4There is a potential difference of 24 V across a 3 Ω resistor. Calculate the current flowing through it.8 A21 A72 A0.125 A
Solution
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The current will double. According to Ohm's law (V = IR), if the potential difference (V) doubles and the resistance (R) remains the same, the current (I) will also double.
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The potential difference across the resistor is 500 V. Using Ohm's law (V = IR), we multiply the current (I = 100 mA = 0.1 A) by the resistance (R = 5000 Ω) to get the potential difference (V = 0.1 A * 5000 Ω = 500 V).
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The resistance of the diode is 0.3 Ω. Using Ohm's law rearranged to R = V/I, we divide the potential difference (V = 0.6 V) by the current (I = 2 A) to get the resistance (R = 0.6 V / 2 A = 0.3 Ω).
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The current flowing through the resistor is 8 A. Using Ohm's law rearranged to I = V/R, we divide the potential difference (V = 24 V) by the resistance (R = 3 Ω) to get the current (I = 24 V / 3 Ω = 8 A).
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