4420

Physics Current Electricity Level: Misc Level

If the resistance arms of a Wheatstone bridge are R 1 = 10 ohms, R 2 = 1000 ohms and the rheostat arm has a resistance of R 3 = 500 ohms, the unknown resistance R will be?

.0013, 5 ohms, 50 ohms, or 1.67 ohms.

3835

Physics Current Electricity Level: University

How much current will flow through the 8.0 Ohm resistor?
a. 1.0A
b. 0.29A
c. 0.50A
d. 2.0 A
e. none of the other responses is

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3833

Physics Current Electricity Level: University

For the circuit shown what is the magnitude of the potential difference across the 6.00 Ohm resistor?
a. 4,50V
b. 3.60 V
c. 6.00 V
d. 6.75 V
e. 1.80 V

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3711

Physics Current Electricity Level: University

Find the magnitude and direction of the current through R1 and R2 in the circuit assuming each battery has an internal resistance of 1.2 ohms.
(b) What is the voltage drop across R1?
(c) What is the power dissipated in R2?

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3706

Physics Current Electricity Level: University

Current power
A Christmas light set consist of 40 identical bulbs in series across  a  120V line. If the total power used is 140 W what is the resistance of each bulb?

3637

Physics Current Electricity Level: University

Conductance
A silver wire of diameter 1.0 mm carries a current of 150 mA. The density of conduction electrons in silver is 5.8 x 10^28 m^-3. How long (on average) does it take for a conduction electron to move 1.0 cm along the wire?

3560

Physics Current Electricity Level: University

 Which one of the following situations results in a conventional electric current that flows westward?
a. A bean of protons moves eastward.
b. An electric dipole moves westward.
c. A beam of electrons moves westward.
d. Abeam of electrons moves eastward.
e. A beam of neutral atoms moves westward.

3536

Physics Current Electricity Level: University

Heating effect of current

The current through a certain heater wire is found to be fairly independent of its temperrature. If the current through the heater wire is doubled, the amount of energy delivered by the heater in a given time interval will
(a) Increase by a factor of two.
(b) Decrease by a factor of two
(c)Increase by a factor of four
(d)Decrease by a factor of four
(e) Increase by a factor of eight

3231

Physics Current Electricity Level: High School

Ohm's law

A 21.0 W energy efficient fluorescent lamp is designed to produce the same illumination as a standard 50.0 W lamp.

a) How much energy does this lamp save during 80.0 h of use?> answer in units of J.

b) If electric energy does cost $0.80/kW-h, how much money is saved in 80.00 h? Answer in units of dollars.

2613

Physics Current Electricity Level: High School

Combination of resistors

Find the equivalent resistance for all of the resistors in the figure at “click here” . The resistance is given in ohms .