# Module 9: Chapter 9: Electricity and Electrical Circuits Assignment

Completion requirements

**Chapter 9: Electricity and Electrical Circuits Assignment (worth 10 points maximum)**

**This assignment aligns with the following Module 9: Chapter 9: Electricity and Electrical Circuits objectives:**

- Use Coulomb’s Law to calculate electric force (CLO5)
- Use the correct units of current, voltage, and resistance in the metric systems. (CLO5)
- Use Ohm’s Law to solve simple circuit problems (CLO5)
- Determine the electric resistance, voltage, electric current, and power in a circuit (CLO2)(CLO3)(CLO5)
- Determine the equivalent resistance for series and parallel combinations of resistors. (CLO2)(CLO5)

**Answer the following questions:**

- The electron and proton of a hydrogen atom are separated, on average, by a distance of about 5.3 x 10
^{-11}meters. Find the magnitudes of the electric force and the gravitational force that each particle exerts on the other.

Mass of electron = 9.109 x 10-^{31} kg

Mass of proton = 1.673 x 10 -^{27} kg

Charge of electron = -1.60 x 10^{-19} C

Charge of proton = +1.60 x 10^{-19} C

- A piece of Styrofoam has a charge of -0.004 C and is placed 3.0 m from a piece of salt with a charge of -0.003 C. How much electrostatic force is produced?

- Two coins lie 1.5 meters apart on a table. They carry identical electric charges. Approximately how large is the charge on each coin if each coin experiences a force of 2.0 N?

- Two balloons are charged with an identical quantity and type of charge: -0.0025C. They are held apart at a separation distance of 8 m. Determine the magnitude of the electrical force of repulsion between them.

- How much current is in a circuit that includes a 9-volt battery and a bulb with a resistance of 3 ohms?

- How much current is in a circuit that includes a 9-volt battery and a bulb with a resistance of 12 ohms?

- You have a large flashlight that takes 4 D-cell batteries. If the current in the flashlight is 2 amps, what is the resistance of the light bulb? (Hint: A D-cell battery has 1.5 volts.)

- According to Ohm’s Law, how much current goes through each of the two resistors in this circuit? Draw the paths of all currents in this circuit.

- Three resistors with resistance values of 12-Ω, 3-Ω, and 21-Ω are placed in series. These would provide a resistance that is equivalent to one _____-Ω resistor.

- In this circuit, three resistors receive the same amount of voltage (24 volts) from a single source. Calculate the amount of current “drawn” by each resistor, as well as the amount of power dissipated by each resistor:

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