(a) Find the voltage drop in the first extension cord having a 0.0360 N resistance and through which 6.20 A is flowing. (b) The second extension cord is cheaper and utilizes thinner wire. It has a resistance of 0.072 N and the current flowing through it is 6.20 A. By what amount does the voltage supplied to the appliance change when the first extension cord is replaced by the second?
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Ohm's Law
The potential difference between a conductor is directly proportional to the current flowing through the conductor. If is the potential difference across the conductor and is the current flowing through the conductor
is the proportionality constant and is known as the resistance of the wire. The resistance of the wire is defined as the opposition offered to the flow of current in the conductor.
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- The heating element of a coffeemaker operates at 120 V and carries a current of 4.50 A. Assuming the water absorbs all of the energy converted by the resistor, calculate how long it takes to heat 0.715 kg of water from room temperature (23.0°C) to the boiling point. minThe cord from an appliance is too short to reach the wall outlet in your room. You have two extension cords to choose from. (a) Find the voltage drop in the first extension cord having a 0.0700 Ω resistance and through which 5.80 A is flowing. V(b) The second extension cord is cheaper and utilizes thinner wire. It has a resistance of 0.700 Ω and the current flowing through it is 5.80 A. By what amount does the voltage supplied to the appliance change when the first extension cord is replaced by the second? Va) If the battery in the circuit below is 15.64V, resistor R1=349.44Ω, and resistor R2=284.01Ω, what is the magnitude of the current flowing through the circuit? Please give your answer in units of milli-Amps (mA). b) If the battery in the circuit below is 9.68V, resistor R1=89.21Ω, and resistor R2=32.88Ω, what is the magnitude of the potential drop across resistor R2? Please give your answer in units of Volts (V).
- Consider the circuit shown in the figure below. (Assume R = 4.80 Ω and ΔV = 12.0 V.) (a) Find the equivalent resistance of the circuit in the figure. I FOUND IT TO BE 12.11 OHMS(b) Find each current in the circuit.(c) Find the potential difference across each resistor.(d) Find the power dissipated by each resistor.(a) What is the cost (in $) of heating a hot tub containing 1590 kg of water from 10.0°C to 40.0°C, assuming 75.0% efficiency to account for heat transfer to the surroundings? The cost of electricity is 9.00 cents/(kW · h). $ (b) What current (in A) was used by the 220 V AC electric heater, if this took 4.20 h? AYou have a simple circuit consisting of a battery and a lightbulb (you can imagine that this circuit is contained within a flashlight). If the total potential difference provided by the batteries in this circuit is 6V, and if you measure the current to be 23.04mA, what is the resistance of the light bulb (created by the thin wire which composes the filament) in units of Ohms?
- The label on a battery-powered radio recommends the use of a rechargeable nickel-cadmium cell (nicads), although it has a 1.25-V open-circuit voltage, whereas an alkaline cell has a 1.58-V open-circuit voltage. The radio has a 3.2 0 resistance. Hint a. With a nicad cell, having an internal resistance of 0.04 02, what is the voltage supplied to the radio, if a single nicad cell is used? The voltage supplied to the radio is b. With an alkaline cell, having an internal resistance of 0.2 , what is the voltage supplied to the radio, if a single alkaline cell is used? The voltage supplied to the radio is The radio's effective resistance is lowered when its volume is turned up. At what value of radio's resistance does a nicad cell begin to supply a greater voltage to the radio than an alkaline cell? Hint for (c) When the radio has an effective resistance of voltage can be obtained with a nicad cell. V. V. 2 or smaller, a greaterPlease answer the questionThe current in a 3.0 V battery of a pocket calculator is 0.17 mA. In one hour of operation, (a) how much charge flows in the circuit and (b) how much energy does the battery deliver to the calculator circuit?
- A resistor is dissipating 119milliwatts [mW] of power. The voltage across the resistor is 26 volts [V]. (a) What is the value of the resistance? Express your answer in units of ohms[Ω]using an appropriate SI prefix such that there are only one, two, or three digits shown to the left of the decimal. (b) What is the current through the resistor? Express your answer in units of amperes [A] using an appropriate SI prefix such that there are only one, two, or three digits shown to the left of the decimal.The cord from an appliance is too short to reach the wall outlet in your room. You have two extension cords to choose from. a) Find the voltage drop in the first extension cord having a 0.0780 Ω resistance and through which 7.60 A is flowing. b)The second extension cord is cheaper and utilizes thinner wire. It has a resistance of 0.780 Ω and the current flowing through it is 7.60 A. By what amount does the voltage supplied to the appliance change when the first extension cord is replaced by the second?