3. The rehbelow shows the variation of the merature of 200 .) Use the graph to state the melting point of lead.
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D) Explain why the graph is a straight line at the start
M
c) Explain what happens to the energy supplied to the lead as I metsata
constant temperature
191
d) The initial temperature of the lead is O'C. Use the graph to determine the total
energy supplied to the load before it starts to mat. The specific heat capacity
of lead is 130 kg

(2) (a) you have a simple circuit that consists of only a battery (δvbat=1.5v) and two resistors with resistance r1=10ω and r2=5ω, connected in series with each other. what is the current running through the battery? (b) you re-arrange your circuit so now r2 is attached in parallel to r1 rather than in series. what is the current running through the battery? (c) you add an additional resistor r3=7ω on the same branch as r2. what is the current running through the battery? (d) what is the power dissipated in r3?