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WorksheetsUEENEEE103A Chapter 4 revision
Total questions: 21
Worksheet time: 11mins
Define the term 'energy'.
Energy is the ability to do work, measured in joules.
Energy is measured in joules.
Energy is the force required to accelerate one kilogram of mass by a rate of one metre per second per second.
What is the relationship between energy and work?
Work and energy are both impacted by the resistance in a circuit
Work is done when energy is transformed from one form to another.
Work and energy are both measured in joules.
What is meant by 'one joule of work'?
When a force of one newton is moved through a distance of one metre, in the direction of the force.
The force required to accelerate a one kilogram mass by a rate of one metre per second per second.
The amount of energy required to turn a motor.
The rate of converting energy, or doing work.
When tightening a bolt with a spanner, how much torque is produced when you apply a 300 N force 150 mm for the centre of the rotation?
(a)
What is the difference between kinetic energy and potential energy? Select the relevant responses below.
Kinetic energy is not renewable.
Potential energy is renewable.
Kinetic energy is energy in motion.
Potential energy is stored energy and is converted to kinetic energy when used.
Select the kinetic energy sources that are used to generate electricity:
Chemical energy
Wind energy
Thermal energy
Nuclear energy
Select the potential energy sources that are used to create electricity:
Gravitational energy
Nuclear energy
Wind energy
hydro-power
What is the correct definition and general equation for power?
Power is the difference between the current and resistance in a circuit, measured in watts. Power = current - resistance.
Power is the rate of converting energy or doing work, measured in watts. Power = work/time
Power is the voltage required to create a current, measured in watts. Power = voltage/time.
Give the equation to find the mechanical power of a motor.
(a)
A motor takes 750 W of electrical power and delivers 630 W of mechanical power. Calculate the efficiency of the motor.
(a)
Find the current flowing in a 1.5 kW heater element connected to 120 V.
(a)
A commercial oven is rated at 400 V, and has three elements that give a combined resistance (when operating) of 16 ohm. Calculate the power.
(a)
A commercial oven is rated at 400 V, and has 3 elements that give a combined resistance (when operating) of 16 ohm and runs for 10 hours. How much electrical energy has it used?
(a)
Find the resistance (R) and the power (P) dissipated in the resistance where the ammeter shows 3.5 A and the voltmeter reads 230 V.
Answer as R=xxohms,P=xxW - no spaces between any of the values.
(a)
Find the resistance (R) and the power (P) dissipated in the resistance where the ammeter shows 6 µA and the voltmeter reads 24 V.
Format your answer R=xxmegohms,P=xxmicrowatts - no spaces between any of the values.
(a)
Find the resistance (R) and the power (P) dissipated in the resistance where the ammeter shows 23 mA and the voltmeter reads 400 V.
Format your answer R=xxkilohms,P=xxW
(a)
Find the resistance if the applied voltage is 230 V.
(a)
Find the current if the resistance is 24 ohm.
(a)
Find the voltage if the resistance is 250 ohm.
(a)
A circuit connection has a resistance of 0.15 ohm. How much power is dissipated as heat in the connection when the current through it is 100 A?
Express your answer as W or kW
(a)
A switch is dissipating 45 W of power as heat when it is passing a current of 15 A. Calculate the resistance of the switch.
(a)
