6 Questions
Ohm's Law 中，电流、电压和电阻之间是什么关系？
I = V/R，V = I*R，R = V/I
电流的单位是什么？
安培（A）
某电路的电压为12V，电阻为4Ω，求电流。
I = V/R = 12V / 4Ω = 3A
某电路中，有20C电荷在5s内流经，求电流。
I = ΔQ / Δt = 20C / 5s = 4A
电压是指什么？
电路中两点之间的电势差
电阻是指什么？
电流流经电路时的阻碍
Study Notes
Electric Current Calculation
Ohm's Law
- Ohm's Law relates electric current (I), voltage (V), and resistance (R) in a circuit
- I = V/R (current = voltage / resistance)
- V = I*R (voltage = current * resistance)
- R = V/I (resistance = voltage / current)
Electric Current Formula
- I = ΔQ / Δt (current = change in charge / change in time)
- ΔQ = charge in coulombs (C)
- Δt = time in seconds (s)
Calculating Electric Current
- To calculate electric current, you need to know the voltage and resistance of the circuit
- Use Ohm's Law to calculate current: I = V/R
- Alternatively, use the electric current formula: I = ΔQ / Δt
Examples
- A circuit has a voltage of 12V and a resistance of 4Ω. What is the electric current?
- I = V/R = 12V / 4Ω = 3A
- A circuit has a charge of 20C flowing through it in 5s. What is the electric current?
- I = ΔQ / Δt = 20C / 5s = 4A
Important Concepts
- Electric current is a flow of electrons
- Electric current is measured in amperes (A)
- Voltage is the potential difference between two points in a circuit
- Resistance is the opposition to the flow of electric current
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