Electricity Physics

A student is attempting to create a circuit that will generate the maximum amount of heat possible. All resistors have equivalent length, area, and shape. Which of the following would be most effective in generating heat?

A 15-Watt fan is connected to a 12 Volt battery. What is the current passing through the circuit in Amperes? Record your answer. Be sure to use the correct place value.

Mathematical Equivalence

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One light bulb in the kitchen burns out and suddenly several lights go out in the house. This would provide evidence that the bulbs were wired in —

• Series

• Parallel

• Reverse

• Different circuits

An average 1.50 V Alkaline AA battery has 9,360 J of stored energy. If the battery is placed in a toy that requires 2.00 amperes of current to operate, how many minutes will the battery last before it runs out of energy?

Mathematical Equivalence

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Tags

NGSS.HS-PS3-1

Which of the following statements are true about an electric circuit? List all that apply.

• Electrons are the mobile charge carriers in an electric circuit.

• Charge is consumed as it moves through the energy-transforming devices of the external circuit. For instance, the amount of charge entering a light bulb in a second is less than that which exits the light bulb in a second.

• A battery is used to power a flashlight circuit. When the battery no longer works, it is because it has run out of charge.

• The location on an electric circuit where the charge possesses the greatest amount of electric potential energy is the + terminal of the battery.

• The path of charge flow from the + to the - terminal of the circuit can consist of nonconductive material.

Which of the following statements are true about electric current? List all that apply.

• Electric current is measured in units of Amperes.

Which of the following statements are true about electric voltage?

• Electric voltage can be expressed in units of joules.

• Electric voltage can be expressed in units of volts.

• The electric voltage of a charge at a given location provides a measure of the rate at which charge flows past that point.

Which of the following statements are true about an electric resistance? List all that apply.

• The resistance of an electric circuit is a measure of the overall amount of hindrance to the flow of charge through the circuit.

• A large resistance value indicates that the charge is encountering a relatively large amount of difficulty in moving through the circuit.

• A 5-ohm resistor would allow a current of 0.5 Amperes when 2.5 Volts is applied across it.

• Increasing the resistance of an electric circuit will cause the current in the circuit to increase.

• The resistance of a conducting wire will increase as the cross-sectional area of the wire is increased.

Which of the following statements are true about electric power and electric potential energy? List all that apply.

• Power is the amount of energy used by an electrical appliance.

• Power is the rate at which energy is used by an electric circuit.

• A kiloWatt-hour is a unit of electric power.

• A Joule/second is a unit of power.

• A 60-Watt light bulb would consume 30 Joules of electrical energy in 2 seconds.

Which of the following statements are true about a series circuit? List all that apply.

• The overall resistance of a circuit increases as more and more resistors are placed in series in the circuit.

• Series circuits are characterized by the fact that there is a single pathway by which charge can travel from the + terminal to the - terminal.

• The total current in a circuit increases as more and more resistors are placed in series in the circuit.

• Suppose that three identical resistors with a resistance of 3-ohms are placed in series with a 12-Volt battery. The current in the circuit is 4 Amps.

• Suppose that two identical resistors are placed in series with a 12-Volt battery. The current in the circuit is 6 amps. The resistance of each resistor is 4 ohms.