What happens when you plug more equipment into apower board in terms of it's resistance and current. Explain.
Plugging another appliance or resistor into a "power board" is like adding another resistor in parallel. The total current that the power board provides goes up, and the effective resistance that it is connected to (V/I) goes down.
An electric hair dryer has a power rating of 1200W and is designated to be used on a 120V household circuit. How much current flows through the dryer when it is in use?
1200w/120v=10A
i=10amps
When you plug in more equipment into a power board, the resistance and current in the circuit are affected. To understand this, let's break it down.
1. Resistance:
Resistance is a property that opposes the flow of electric current. In a power board, there is a resistance associated with the power board itself as well as the resistance of the devices connected to it. When you add more equipment to the power board, it increases the total resistance in the circuit.
The resistance of a power board is typically very low, as it is designed to minimize energy losses and provide efficient electrical connections. However, as you connect more devices, the resistance of the power board itself becomes a smaller fraction of the total resistance. The resistance of the connected devices becomes more significant in determining the overall resistance of the circuit.
2. Current:
Current is the flow of electric charge through a circuit. According to Ohm's Law (I = V/R), the current flowing through a circuit is inversely proportional to the resistance. Therefore, when you increase the resistance in the circuit by adding more equipment to a power board, the current decreases.
As the total resistance increases, the current flowing through the circuit decreases because the applied voltage remains constant. This is due to the reduced ability of the circuit to allow the flow of electric charges.
It's important to note that the power board itself should have a safe current rating to avoid overloading. Manufacturers specify the maximum current the power board can handle to prevent overheating and potential hazards.
In summary, when you plug in more equipment into a power board, it increases the total resistance in the circuit, leading to a decrease in the current flowing through the circuit.