K Kelso New member Jun 4, 2010 #1 a)20 / 100 = 1 / 5 efficiency If you need a percentage muliply by 100, so it's 20% efficient b) energy wasted = total energy - energy used i.e. enegery wasted = 100 - 20 = 80J
a)20 / 100 = 1 / 5 efficiency If you need a percentage muliply by 100, so it's 20% efficient b) energy wasted = total energy - energy used i.e. enegery wasted = 100 - 20 = 80J
K Kelso New member Jun 4, 2010 #2 a)20 / 100 = 1 / 5 efficiency If you need a percentage muliply by 100, so it's 20% efficient b) energy wasted = total energy - energy used i.e. enegery wasted = 100 - 20 = 80J
a)20 / 100 = 1 / 5 efficiency If you need a percentage muliply by 100, so it's 20% efficient b) energy wasted = total energy - energy used i.e. enegery wasted = 100 - 20 = 80J
C Carly New member Jun 4, 2010 #3 a light bulb radiates 20J of energy for every 100J of electrical energy supplied to it. Calculate: a) The efficiency of the light bulb.- b)The energy wasted by the light bulb for every 100J of electrical energy supplied to it. Thank you x
a light bulb radiates 20J of energy for every 100J of electrical energy supplied to it. Calculate: a) The efficiency of the light bulb.- b)The energy wasted by the light bulb for every 100J of electrical energy supplied to it. Thank you x
W welcome news New member Jun 4, 2010 #4 Efficiency = work got out over work got in = 20J/100J = 0.2 = 20% efficient Energy wasted = energy put in - energy output = 100J - 20J = 80J
Efficiency = work got out over work got in = 20J/100J = 0.2 = 20% efficient Energy wasted = energy put in - energy output = 100J - 20J = 80J
K Kelso New member Jun 4, 2010 #5 a)20 / 100 = 1 / 5 efficiency If you need a percentage muliply by 100, so it's 20% efficient b) energy wasted = total energy - energy used i.e. enegery wasted = 100 - 20 = 80J
a)20 / 100 = 1 / 5 efficiency If you need a percentage muliply by 100, so it's 20% efficient b) energy wasted = total energy - energy used i.e. enegery wasted = 100 - 20 = 80J
