Ohm's Law

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The ______ is the rate at which charge flows through a surface.

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Answer: Current

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Explanation: Current (I) is defined as the rate of charge (Q) flow over time (t).

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Electric current Formula

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Hint

Answer: I=ΔQ / Δt

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  • I: Current (Amperes, A, scalar)

  • ΔQ: Change in charge (Coulombs, C, scalar)

  • Δt: Change in time (seconds, s, scalar).

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Example: A current of 2A means 2 Coulombs of charge pass through a wire every second.

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10 Terms

1
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The ______ is the rate at which charge flows through a surface.

Answer: Current

.

.

Explanation: Current (I) is defined as the rate of charge (Q) flow over time (t).

.

.

2
New cards

Electric current Formula

Answer: I=ΔQ / Δt

.

.

  • I: Current (Amperes, A, scalar)

  • ΔQ: Change in charge (Coulombs, C, scalar)

  • Δt: Change in time (seconds, s, scalar).

.

.

Example: A current of 2A means 2 Coulombs of charge pass through a wire every second.

3
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The SI unit for current is the ______ or the Ampere

Answer: Ampere (A) = Coulumb / seconds

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Example: A smartphone charger might deliver a current of 1.5A.

4
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The phrases "flow of current" and "current flow" are commonly used, but the word "flow" is ______ because current is already defined as a flow of charge

Answer: Redundant

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Explanation: Saying "current flow" is redundant because "current" inherently means charge flow.
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Example: Saying "water flow flow" is incorrect; similarly, "current flow" is redundant.

5
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The word ______ means a closed loop of some sort around which current circulates.

Answer: Circuit
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Explanation: A circuit is a closed path allowing continuous charge movement.
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Example: A battery connected to a bulb with wires forms a circuit.

6
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No charge would flow without a closed conducting path from the positive terminal of the battery into one side of the bulb, out the other side, and back to the negative terminal of the battery.

Explanation: Current requires a closed loop from the battery’s positive to negative terminal.
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Example: If a wire breaks, the circuit opens, and the bulb turns off.

7
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The most important quantities that characterize how the bulb works in different situations are the current in the bulb and the ______ across the bulb.

Answer: Potential difference (VV)
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Explanation: Potential difference (voltage) determines the energy supplied per charge.
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Equation: V=IRV=IR, where VV = voltage (Volts, V, scalar).

8
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A digital ______ can be used to measure voltage, current, or resistance.

Answer: Multimeter
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Example: A digital multimeter can measure a 9V battery’s voltage or a resistor’s resistance.

9
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Ohm’s Law is given by the equation:

Answer: V = IR

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Variables:

  • V: Voltage (Volts, V, scalar)

  • I: Current (Amperes, A, scalar)

  • R: Resistance (Ohms, Ω, scalar).

Example: If V=12VV=12V and R=4ΩR=4Ω, the current I=3AI=3A.

10
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Materials that obey Ohm’s law and have a consistent resistance over a wide range of voltages are said to be ______.

Answer: Ohmic
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Explanation: Ohmic materials (e.g., resistors) maintain constant resistance regardless of voltage.
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Example: A copper wire behaves ohmically at low voltages.