Question

review questions 1. what is a coulomb? 2. what is an amp? 3. define voltage. 4. define ohm. 5. define watt. 6. an electric heating element has a resistance of 16ω and is connected to a voltage of 120 v. how much current will flow in this circuit? 7. how many watts of heat are being produced by the heating element in question 6? 8. a 240 - v circuit has a current flow of 20 a. how much resistance is connected to the circuit?

Explanation:

1. A coulomb is the SI unit of electric charge, equal to the charge transported by a constant current of 1 ampere in 1 second.
2. An amp (ampere) is the SI unit of electric current, defined as the constant current that produces a specified force between two parallel conductors.
3. Voltage is the electric potential difference between two points, driving electric charge flow.
4. An ohm is the SI unit of electrical resistance, the resistance of a conductor with 1 volt across it and 1 ampere flowing through it.
5. A watt is the SI unit of electric power, equal to 1 joule of energy per second.
6. Use Ohm's Law ($I=\frac{V}{R}$) to find current from voltage and resistance.
7. Use power formula ($P=\frac{V^2}{R}$) to calculate heat (power) from voltage and resistance.
8. Use Ohm's Law ($R=\frac{V}{I}$) to find resistance from voltage and current.

Answer:

1. A coulomb is the SI unit of electric charge, equivalent to the charge carried by 1 ampere of current flowing for 1 second.
2. An amp (ampere) is the SI unit of electric current, measuring the rate of flow of electric charge.
3. Voltage (electric potential difference) is the force that drives electric current through a conductor, measured in volts.
4. An ohm is the SI unit of electrical resistance, representing the opposition to electric current flow in a conductor.
5. A watt is the SI unit of electric power, measuring the rate at which electrical energy is transferred or used.

6.

Step1: Apply Ohm's Law for current

$I = \frac{V}{R} = \frac{120\ \text{V}}{16\ \Omega} = 7.5\ \text{A}$
Final answer for 6: $7.5\ \text{A}$
7.

Step1: Apply power formula for heat

$P = \frac{V^2}{R} = \frac{(120\ \text{V})^2}{16\ \Omega} = 900\ \text{watts}$
Final answer for 7: $900\ \text{watts}$
8.

Step1: Apply Ohm's Law for resistance

$R = \frac{V}{I} = \frac{240\ \text{V}}{20\ \text{A}} = 12\ \Omega$
Final answer for 8: $12\ \Omega$