Press "Enter" to skip to content

How many ohms of resistance must be present in a circuit that has 240 volts and a current of 15 amps?

How many ohms of resistance must be present in a circuit that has 240 volts and a current of 15 amps?

Answer: The correct answer is 16 ohms.

What is the relationship between electric current and resistance?

The relationship between current, voltage and resistance is expressed by Ohm’s Law. This states that the current flowing in a circuit is directly proportional to the applied voltage and inversely proportional to the resistance of the circuit, provided the temperature remains constant.

What is the relation between charge and voltage?

Also, the more capacitance the capacitor possesses, the more charge will be forced in by a given voltage. This relation is described by the formula q=CV, where q is the charge stored, C is the capacitance, and V is the voltage applied.

Is voltage proportional to charge?

1 volt is equal to the force required to move 1 coulomb of charge past an arbitrary point in 1 second. So voltage measures how much energy is imparted to each coulomb of charge. Capacitance is when a dielectric keeps oppositely charged plates from equalizing there EMF.

Does charge affect voltage?

Electrical energy is the energy released when a charge ‘falls’ through a potential difference (voltage). The voltage exists whether the charge is present or not.

Is 15 volts too high?

Higher than 15 volts indicates a fault in the charging system’s voltage regulator or related circuits. If it’s substantially excessive, this can cause electrical system and/or battery damage. You mentioned your voltmeter runs at about 15 volts most of the time.

How do you calculate voltage charge?

You can also use Ohm’s law (V = IR) to calculate current from voltage and resistance. For a circuit with voltage 3 V and resistance 5 Ω that is applied for 10 seconds, the corresponding current that results is I = V / R = 3 V / 5 Ω = 0.6 A, and the total charge would be Q = It = 0.6 A × 10 s = 6 C.

Why current is not used up in a circuit?

Electric current is the same all the way around the circuit. It does not get used up. They have to do work to push the current around the circuit. By doing this work, the chemicals get used up and, eventually, the cell will need to be replaced.

How do capacitors affect current?

Thus, a capacitor lets more current flow as the frequency of the source voltage is increased. The apparent resistance of a capacitor in an AC circuit is less than its DC resistance. This apparent AC resistance is called capacitive reactance, and its value decreases as the applied frequency increases.

What size capacitor can kill you?

Over 15 kV the safety limit is 350 milli Joules. It’s difficult to estimate a general value, but in ac mains even 1 micro Farad could kill, at 400 volts dc 125 micro F could probably be fatal and 1250 micro Farads is dead. Essentially any capacitor that stores over 5 Joules must be provided with bleeder resistor!