Warming up with energy Lesson objectives * know the difference between temperature and heat * Find out through experiment; the power of a bunsen burner.

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Presentation transcript:

Warming up with energy Lesson objectives * know the difference between temperature and heat * Find out through experiment; the power of a bunsen burner

Warming up with energy

HEAT 50cm 3 water thermometer Experiment to compare boiling times for different amounts of water Prediction: ……………………………………………………….. Conclusion: ……………………………………………………….. Temp / C For 50 cm 3 water Time / min

Temp / C TIME / mins

0 Temp / C TIME / mins Temp / C For 50 cm 3 water Time / min

0 Temp / C For 50 cm 3 water Time / min Temp / C TIME / mins

0 Temp / C TIME / mins Gradient = Δ temp Δ time

0 Temp / C TIME / mins Gradient = Δ temp = Δ T Δ time Δ t

0 Temp / C TIME / mins Gradient = Δ temp = Δ T Δ time Δ t = (68 -33) C 60 sec =

0 Temp / C TIME / mins Gradient = Δ temp = Δ T Δ time Δ t = (68 -33) C 60 sec = 0.58 C / sec

0 Temp / C TIME / mins Gradient = Δ temp = Δ T Δ time Δ t = (68 -33) C 60 sec = 0.58 C / sec Bunsen power: (assuming no energy loss) Δ U = m c Δ T Δ t =

0 Temp / C TIME / mins Gradient = Δ temp = Δ T Δ time Δ t = (68 -33) C 60 sec = 0.58 C / sec Bunsen power: (assuming no energy loss) Δ U = m c Δ T Δ t = 0.05 x 4200 x 0.58 =

0 Temp / C TIME / mins Gradient = Δ temp = Δ T Δ time Δ t = (68 -33) C 60 sec = 0.58 C / sec Bunsen power: (assuming no energy loss) Δ U = m c Δ T Δ t = 0.05 x 4200 x 0.58 = 121 W