Download Pre AP Physics – Circuits and Magnetism Review Sheet

Pre AP Physics – Circuits and Magnetism Review Sheet
1. A 10 Ώ resistor, a 20 Ώ resistor and a 5 Ώ resistor are connected in series across a 90 V battery.
a. What is the equivalent resistance of the circuit? [35 Ώ]
b. What is the current in the circuit? [2.571 A]
2. A 120 Ώ resistor, a 60 Ώ resistor and a 40 Ώ resistor are connected in parallel and placed across a potential difference of
12 V.
a. What is the equivalent resistance of the circuit? [20 Ώ]
b. What is the current through the entire circuit? [0.6A]
c. What is the current through each branch of the parallel circuit? [0.1 A, 0.2 A, 0.3 A]
3. A wire 115 m long is at right angles to a uniform magnetic field. The field has a magnetic field strength of 5.0 x 10 -5 T. The
current through the wire is 400 A. Find the magnitude of the force. [2.3 N]
4. A wire 0.10 m long carries a current of 5.0 A. The wire is at right angles to a uniform magnetic field. The force on the wire
is 0.20 N. What is the magnitude of the magnetic field? [0.40 T]
5. A beam of electrons (q = 1.6 x 10-19 C) travels at 3.0 x 106 m/s through a 0.04 T uniform magnetic field. The beam is at
right angles to the magnetic field. What is the magnitude of the force acting on each electron? [1.92 x 10 -14 N]
6. A wire 0.50 m long carrying a current of 8.0 A is at right angles to a uniform magnetic field. The force on the wire is 0.40 N.
What is the strength of the magnetic field? [0.10 T]
7. A certain strand of miniature lights contains 35 bulbs wired in series, with each bulb having a resistance of 15 Ώ. What is
the equivalent resistance when three such strands are connected in parallel across a potential difference of 120.0 V? [175 Ώ]
8. Three resistors with values of 28 Ώ, 58 Ώ, 22 Ώ, respectively, are connected in series. What is their equivalent resistance?
[108 Ώ]
resistance? [9.259Ώ]
4 m/s and has a magnetic force of 3.0 x 10–18 N exerted on it. If the
magnetic field points upward, what is the magnitude of the magnetic field? What is the direction of the force? [2.2 x 10 -4 T]
11. Draw a schematic diagram that contains one battery, two resistors, one capacitor, and one closed switch.
12. What is the equivalent resistance for the resistors in the figure above? [10 Ώ]
13. Three resistors connected in parallel have individual values of 4.0 Ώ, 6.0 Ώ, and 10.0 Ώ, as shown above. If this
combination is connected in series with a 12.0 V battery and a 2.0 Ώ resistor, what is the equivalent resistance in the circuit?
[3.935 Ώ]
b. What is the current in and the potential difference across the 10.0 Ώ resistor? [0.590 A, 5.902 V]
14. A proton moves north at a velocity of 1.6 x 104 m/s and has a magnetic force of 1.6 x 10–18 N exerted on it. If the
magnetic force is to the east, what is the magnitude and direction of the magnetic field? [6.25 x 10–4 T, upward]
15. If the potential difference across a pair of batteries used to power a flashlight is 6.0 V, what is the potential difference
across the flashlight bulb? [6.0 V]
16. In the schematic diagram above, will there be a current? Why or why not? [No]
17. Find the direction of the force on an electron moving through the magnetic field shown above. [upward]
18. The Figure above depicts a household circuit containing several appliances and a circuit breaker attached to a 120 V
source of potential difference.
a. Is the current in the toaster equal to the current in the microwave?
b. Is the potential difference across the microwave equal to the potential difference across the popcorn popper?
c. Is the current in the circuit breaker equal to the current in all of the appliances combined?
19. For the circuit shown in the figure above, determine the following:
a. the current and potential difference across the 2 Ώ resistor [1.714 A, 3.428 V]
b. the current and potential difference across the 12 Ώ resistor [0.429 A, 5.142 V]