Question

Capacitors are used in electrical circuits where appliances need rapid?

• A. Current
• B. Voltage
• C. Watt
• D. Resistance

Answer 1

The correct option is A

Current

The explanation for the correct option:

In the case of option $\mathrm{A}$:

1. Electrical energy is stored by both capacitors and batteries but in very different ways.
2. As a capacitor can't manufacture new electrons, it's significantly simpler than a battery.
3. When the capacitor is charged fully, it has the same voltage as the battery (1.5 volts on the battery means 1.5 volts on the capacitor).
4. They need rapid current to get them started.

The explanation for the incorrect option:

In the case of option $\mathrm{B}$:

1. Voltage is the force exerted by a power source on charged electrons (current) in a conducting loop, allowing them to perform tasks such as lighting a lamp.
2. In a nutshell, voltage equals pressure and is measured in volts. ($\text{V}$).

In the case of option $\mathrm{C}$:

1. The watt (symbol: $\mathrm{W}$) is a power or radiant flux measurement unit.

In the case of option $\mathrm{D}$:

1. Resisting something that delays or stops something is an unwillingness to give in.
2. Wind against the wings of a plane is an example of resistance. A youngster battling against her abductor is an illustration of resistance.

Therefore, option $\mathrm{A}$ is the correct choice.