Physics Current Electricity Level: Misc Level
In Fig the ideal batteries have emfs E1 =150 V and E2 =50 V and the resistances are R1 =3.0 Q and R2=2.0 Q. If the potential at P is defined to be 150 V, What is the potential at Q?
Physics Current Electricity Level: Misc Level
A Parallel -plate capacitor has a plate area of 126 square centimeters and a plate separation of 0.58 mm, Half the area between the plates is filled with Teflon . The other half is filled with air.
a.when 20 V is applied, the charge on this capacitor is ---
b. The maximum voltage that can be applied to the capacitor is --
Physics Current Electricity Level: Misc Level
A charge of 5.0 is placed at the origin and another charge of -9.4
is placed at x =26.0 cm.
a. where on the x -axis is the resulting electric potential ( voltage) is equal to zero volts?
Physics Current Electricity Level: Misc Level
a time delay of 25 ms is required for the voltage to fall to 20% of its maximum value.rearrange the equation to find a new value of resistance to achieve this if the capacitance is kept the same.
Physics Current Electricity Level: Misc Level
Calculate the currents through all the resistors in the diagram.
Physics Current Electricity Level: Misc Level
Apply Kirchhoff s rules to the following circuit and (a) the current in each resistor and (b)the rate at which energy is being delivered to the 25 resistor.
Physics Current Electricity Level: Misc Level
An extension cord made of two wires of diameter 0.129 cm (no. 16 copper wire) and of length 2.7 m (9.0 ft) is connected to an electric heater which draws 10.0 A on a 1.2 E 2-V line. How much power is dissipated in the cord?
Physics Current Electricity Level: Misc Level
At $0. 071 per kWh, what does it cost to leave a 1.0 E 2 -W porch light on day and night for a year?
Physics Current Electricity Level: Misc Level
What is the maximum voltage that can be applied across a 7.3 -k? resistor rated at 1 /4 watt?
Enter your answer with 2 significant digits.
Physics Current Electricity Level: Misc Level
Calculate the ratio of the resistance of 22.0 m of aluminum wire 2.5 mm in diameter, to 16.0 m of copper wire 1.8 mm in diameter.
Enter the ratio as a decimal.
Physics Current Electricity Level: Misc Level
What voltage will produce 0.30 A of current through a 4.6 E 3 resistor?
Physics Current Electricity Level: Misc Level
A current of 2.30 A flows in a wire. How many electrons are flowing past any poin in the wire per second?
Physics Current Electricity Level: Misc Level
A 9.0 ohms resistor and a 6.0 ohms resistor are connected in a series with a power supply. (a) the voltage drop across the 6.0 ohms resistor is measured to be 12 V. Find the voltage output of the power supply. (b)The two resistors are connected in parallel across a power supply, and the current through the 9 ohms resistor is found to be.25 A. Find the voltage setting of the power supply.
Physics Current Electricity Level: Misc Level
At 40.0 C, the resistance of a segment of a segment of gold wire is 100.0 Ohms. When the wire is placed in a liquid bath, the resistance decreases to 97.0 Ohms. What is the temperature of the bath?
Physics Current Electricity Level: Misc Level
If a silver wire has a resistance of 10.0 ohms at 20.0 C what resistance does it have at 40.0 C? Neglect any change in length or cross -sectional area resulting from the change in temperature?
