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A 120V wall outlet will push 60 amperes through a 20 ohm circuit, generating 7200 watts of power in the process.
That is a lot of power.
Let me repeat.
That is a lot of power.
Don't even think about trying this in the lab. You are talking about serious energy here and risk of fire and injury or death,
Besides, the question is loaded. There is no 60 ampere 120V wall outlet, The closest you could come would be a 60 amp 240V range or water heater outlet.
Think about this very carefully. Stick a 20 ohm resistor in an ordinary 120V outlet, turn it on, and the resistor and the breaker are going to rush to beat each other before one trips or the other blows up. What if the circuit breaker failed? What if someone got hurt? What if someone died? Think about calling your parents and saying you've been arrested and charged with negligent murder, and that your entire career is ruined.
What else can I help you with?
What does the resistance in an electrical circuit limit?
Current flow. It's also worthy of noting that a resistor doesn't limit-by, it limits-to, and the current is dependent on the voltage. I[A] = U[V] / R[ohm] It's also worth to note, that the power flowing through said resistor with resistance R is I[A] * U[V] for DC circuits - helps to remember this well when picking appropriately-rated resistors for replacement. Example: let's say we have a 20-ohm, 2W resistor. If we place it in a circuit with 5V, we will get 5V / 20ohm = 250mA (0.25A) of current flowing through the resistor. The power the resistor will "see" is 250mA * 5V = 1.25W, so it's safe. But let's now put that same resistor in a 12V circuit. The current flowing will be 12V / 20ohm = 600mA (0.6A), and the power will be 600mA * 12V = 7.2W, so the resistor will burn.
What will be the impedance of a C-R circuit consisting of a resistance of 20ohm and capacitance 2microfarad when it is connected to direct current?
In a direct current (DC) circuit, a capacitor will eventually charge up and act as an open circuit, meaning it will not allow current to flow after reaching full charge. As a result, the impedance of a resistor-capacitor (C-R) circuit under DC conditions is simply the resistance value. Therefore, the impedance of the given C-R circuit with a resistance of 20 ohms and a capacitance of 2 microfarads is 20 ohms.
