An electric current in a wire is a flow of electrons. The current supplied by cells and batteries is the direct current.
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What is the size of a current? Give the units of Charge and the equation to calculate it.
The size of a current is the rate of flow of charged particles. The unit of charge is coulomb (C) and the equation is Q(coulombs)= I (ampere) x T (seconds)
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What is the current in an electric circuit measured by?
An Ammeter.
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What is the potential difference measured by?
A voltmeter, placed in parallel with the component.
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What is potential difference?
The potential difference is the energy transferred by each coulomb of a charge that passes through a component.
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What is resistance caused by?
An electric current flows when electrons move through a conductor, such as a metal wire. The moving electrons can collide with the ions in the metal. This makes it more difficult for the current to flow, and causes resistance.
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How do you work out resistance?
RΩ=V/I
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What are thermistors and what are they used for?
A thermistor is a specific type of resistor that uses sensors to help regulate cold and heat. They are also used for voltage regulation, volume control, time delays, and circuit protection.
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What is Power and what are the units?
Power is a measure of how quickly energy is transferred. The unit of power is the watt, W.
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What is the equation for Power?
P = E ÷ T
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How do you calculate the energy transferred?
E = V×Q
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Other cards in this set
Card 2
Front
What is the size of a current? Give the units of Charge and the equation to calculate it.
Back
The size of a current is the rate of flow of charged particles. The unit of charge is coulomb (C) and the equation is Q(coulombs)= I (ampere) x T (seconds)
Card 3
Front
What is the current in an electric circuit measured by?
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