Question

definition

1. a device that converts chemical energy to electrical energy
2. requires a complete loop
3. the difference in electrical potential energy between two places in an electric field
4. is the following sentence true or false? three common voltage sources are batteries, solar cells, and generators.

ohms law (page 607)

1. is the following sentence true or false? according to ohms law, the voltage in a circuit equals the product of the energy and the resistance.
2. doubling the voltage in a circuit doubles the current if is held constant.
3. is the following sentence true or false? doubling the resistance in a circuit will halve the current if voltage is held constant.

Explanation:

1. A battery is a device that converts chemical energy to electrical energy.
2. An electric circuit requires a complete loop.
3. Voltage is the difference in electrical potential energy between two places in an electric field.
4. Batteries, solar cells, and generators are common voltage sources, so the statement is true.
5. According to Ohm’s law, \(V = IR\) (voltage equals current times resistance), not energy times resistance, so the statement is false.
6. From \(I=\frac{V}{R}\), if \(R\) is constant, doubling \(V\) doubles \(I\).
7. From \(I = \frac{V}{R}\), if \(V\) is constant, doubling \(R\) halves \(I\), so the statement is true.

Answer:

1. c. battery
2. (No option given in the problem's options for this, but conceptually related to electric circuit which is a system requiring a loop)
3. b. voltage
4. True
5. False
6. resistance
7. True