# P5 Electric circuits

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• Created by: fantasy
• Created on: 25-01-13 09:15
• P5 Electric circuits
• Motors
• Electric motors transfer electrical energy to kinetic energy using magnets and a coil of wire.
• e.g. DVD player turns the disk using a motor.
• You can use Fleming's left hand rule to find the direction of the current, direction of the force and the magnetic field.
• Motors
• Electric motors transfer electrical energy to kinetic energy using magnets and a coil of wire.
• e.g. DVD player turns the disk using a motor.
• You can use Fleming's left hand rule to find the direction of the current, direction of the force and the magnetic field.
• If the wire carrying the current is perpendicular to the magnetic field, then it will experience a force.
• The direction of the current can be reversed using a commutator. The speed can be increased by increasing the strength of the magnetic field.
• If the wire carrying the current is perpendicular to the magnetic field, then it will experience a force.
• The direction of the current can be reversed using a commutator. The speed can be increased by increasing the strength of the magnetic field.
• An electric current (measured in Amps, A) is a flow of charge around a circuit.
• The size of a current depends on the voltage (the push) and the resistance. Voltage is measured in Volts, V.
• Resistance in a circuit reduces the amount of current passing through because there are more obstacles to stop the electrons passing through freely.
• If the resistance is higher, the current is smaller but the voltage is bigger. This is due to a bigger push needed for the voltage and less electrons being able to pass through easily.
• An electric current (measured in Amps, A) is a flow of charge around a circuit.
• The size of a current depends on the voltage (the push) and the resistance. Voltage is measured in Volts, V.
• Resistance in a circuit reduces the amount of current passing through because there are more obstacles to stop the electrons passing through freely.
• If the resistance is higher, the current is smaller but the voltage is bigger. This is due to a bigger push needed for the voltage and less electrons being able to pass through easily.
• Resistance is measured in Ohms, ?
• Resistance = voltage/curent
• Resistance is measured in Ohms, ?
• Resistance = voltage/curent
• Static electricity
• Some insulating materials can become electrically charged. When they are rubbed together, one of them loses electrons so becomes positively charged and the other gains electrons to become negatively charged.
• Static electricity only happens when the two charges are different so will attract each other. if they are the same they will repel each other.
• Static electricity allows things to stick to others if they have opposite charges.
• Static electricity only allows insulators to work but not conductors. This is because the electrons in metals are free to move.