Podcast
Questions and Answers
What is the function of an ammeter?
What is the function of an ammeter?
- To measure power in a circuit
- To measure voltage in a circuit
- To measure resistance in a circuit
- To measure electric current in a circuit (correct)
What unit is used to measure electric current?
What unit is used to measure electric current?
- Volts
- Watts
- Ohms
- Amps (correct)
What determines if two objects will attract each other?
What determines if two objects will attract each other?
- Similar electric charges
- Neutral electric charges
- Similar magnetic poles
- Opposite magnetic poles (correct)
What is a battery?
What is a battery?
Which of the following materials is a good conductor of electricity?
Which of the following materials is a good conductor of electricity?
What is the purpose of a core in an electromagnet?
What is the purpose of a core in an electromagnet?
What is electric current?
What is electric current?
What type of charge does an electron have?
What type of charge does an electron have?
Which of the following is an example of an insulator?
Which of the following is an example of an insulator?
What does the 'rating' of a cell or bulb refer to?
What does the 'rating' of a cell or bulb refer to?
Flashcards
Ammeter
Ammeter
A device for measuring electric current in a circuit.
Amps
Amps
Units of measurement of electric current, symbol A.
Atom
Atom
A neutral particle; everything is made of atoms.
Cell
Cell
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Current
Current
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Electromagnet
Electromagnet
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Electron
Electron
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Insulator
Insulator
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Magnetic field
Magnetic field
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Resistance
Resistance
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Study Notes
- An ammeter measures electric current in a circuit.
- Electric current is measured in amps (A).
- All matter consists of atoms, which are neutral particles.
- Attraction is the pulling together of objects, such as opposite magnetic poles or positive and negative charges.
- A battery consists of two or more electrical cells joined together.
- A cell is a chemical energy store that pushes charge around a circuit.
- Conductors efficiently conduct charge or energy; metals and graphite are examples.
- A core of magnetic material inside a coil strengthens an electromagnet's magnetic field.
- Current is the flow of electrical charge (electrons) in a complete circuit per second.
- Electric charge is a material or particle property that can be positive or negative.
- An electrical field is a region where a charged material or particle experiences a force.
- An electromagnet is a temporary magnet produced by electric current.
- Electrons are negatively charged particles in atoms that flow in a wire when current flows.
- Insulators do not conduct electricity or transfer energy well.
- Lightning involves a current through the air, producing light and sound.
- A magnetic field is a region where a force acts on a magnet or magnetic material.
- Magnetic field lines are imaginary lines showing the direction of force on magnetic material.
- Magnetic materials are attracted to magnets, including iron, steel, nickel, and cobalt.
- To magnetise is to turn something into a magnet.
- Negative charge is the charge on an electron or an object with transferred electrons.
- Neutral describes an object or particle with no net charge, where positive and negative charges cancel out.
- Neutrons are neutral particles found in atoms.
- The north pole of a magnet points towards the north.
- Resistance is measured in ohms (Ω).
- A parallel circuit has two or more loops for the current.
- Positive charge is the charge on a proton or an object that has lost electrons.
- Potential difference measures the push of a cell or battery, or the energy it supplies.
- Protons are positively charged particles in atoms.
- Rating is the potential difference at which a cell or bulb should operate.
- Repulsion is the pushing away of like objects, e.g., like magnetic poles or like electrical charges.
- Resistance indicates how difficult it is for current to flow.
- A series circuit has components joined in a single loop.
- The south pole of a magnet points towards the south.
- A switch controls current by making or breaking the circuit.
- Voltage is the measure of a cell or battery's strength to send current around a circuit.
- A voltmeter measures voltage.
- Voltage is measured in volts (V).
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